style(ctb): move external contracts to vendor dir (#2924)

Moves the two contracts we use that were written by external parties
into their own folder named vendor. By separating these contracts into
their own folder, we can be very explicit that these contracts are not
meant to be tested or modified.
Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>

.changeset/nasty-moons-rush.md

+---
+'@eth-optimism/contracts-bedrock': patch
+---
+
+Move contracts written by external parties into a vendor folder

packages/contracts-bedrock/.prettierignore

@@ -2,6 +2,7 @@
 node_modules
 lib
 contracts/test/*.t.sol
+contracts/vendor/*.sol
 
 # build output
 artifacts
@@ -11,8 +12,6 @@ typechain
 coverage*
 deployments
 
-contracts/L2/WETH9.sol
-
 # Other autogenerated files
 gasReporterOutput.json
 slither.db.json

packages/contracts-bedrock/.solhintignore

@@ -2,4 +2,4 @@
 node_modules
 lib
 contracts/test/*.t.sol
-contracts/L2/WETH9.sol
+contracts/vendor/*.sol

packages/contracts-bedrock/.storage-layout

@@ -265,19 +265,19 @@
 ➡ WETH9
 =======================
 
-+-----------+-------------------------------------------------+------+--------+-------+------------------------------+
++-----------+-------------------------------------------------+------+--------+-------+----------------------------------+
 | Name      | Type                                            | Slot | Offset | Bytes | Contract                         |
-+====================================================================================================================+
-| name      | string                                          | 0    | 0      | 32    | contracts/L2/WETH9.sol:WETH9 |
-|-----------+-------------------------------------------------+------+--------+-------+------------------------------|
-| symbol    | string                                          | 1    | 0      | 32    | contracts/L2/WETH9.sol:WETH9 |
-|-----------+-------------------------------------------------+------+--------+-------+------------------------------|
-| decimals  | uint8                                           | 2    | 0      | 1     | contracts/L2/WETH9.sol:WETH9 |
-|-----------+-------------------------------------------------+------+--------+-------+------------------------------|
-| balanceOf | mapping(address => uint256)                     | 3    | 0      | 32    | contracts/L2/WETH9.sol:WETH9 |
-|-----------+-------------------------------------------------+------+--------+-------+------------------------------|
-| allowance | mapping(address => mapping(address => uint256)) | 4    | 0      | 32    | contracts/L2/WETH9.sol:WETH9 |
-+-----------+-------------------------------------------------+------+--------+-------+------------------------------+
++========================================================================================================================+
+| name      | string                                          | 0    | 0      | 32    | contracts/vendor/WETH9.sol:WETH9 |
+|-----------+-------------------------------------------------+------+--------+-------+----------------------------------|
+| symbol    | string                                          | 1    | 0      | 32    | contracts/vendor/WETH9.sol:WETH9 |
+|-----------+-------------------------------------------------+------+--------+-------+----------------------------------|
+| decimals  | uint8                                           | 2    | 0      | 1     | contracts/vendor/WETH9.sol:WETH9 |
+|-----------+-------------------------------------------------+------+--------+-------+----------------------------------|
+| balanceOf | mapping(address => uint256)                     | 3    | 0      | 32    | contracts/vendor/WETH9.sol:WETH9 |
+|-----------+-------------------------------------------------+------+--------+-------+----------------------------------|
+| allowance | mapping(address => mapping(address => uint256)) | 4    | 0      | 32    | contracts/vendor/WETH9.sol:WETH9 |
++-----------+-------------------------------------------------+------+--------+-------+----------------------------------+
 
 =======================
 ➡ ProxyAdmin

packages/contracts-bedrock/contracts/L1/OptimismPortal.sol

@@ -5,7 +5,7 @@ import { Initializable } from "@openzeppelin/contracts/proxy/utils/Initializable
 import { ExcessivelySafeCall } from "excessively-safe-call/src/ExcessivelySafeCall.sol";
 import { L2OutputOracle } from "./L2OutputOracle.sol";
 import { WithdrawalVerifier } from "../libraries/Lib_WithdrawalVerifier.sol";
-import { AddressAliasHelper } from "../libraries/AddressAliasHelper.sol";
+import { AddressAliasHelper } from "../vendor/AddressAliasHelper.sol";
 import { ResourceMetering } from "./ResourceMetering.sol";
 
 /**

packages/contracts-bedrock/contracts/L2/L2CrossDomainMessenger.sol

 // SPDX-License-Identifier: MIT
 pragma solidity ^0.8.9;
 
-import { AddressAliasHelper } from "../libraries/AddressAliasHelper.sol";
+import { AddressAliasHelper } from "../vendor/AddressAliasHelper.sol";
 import { Lib_PredeployAddresses } from "../libraries/Lib_PredeployAddresses.sol";
 import { CrossDomainMessenger } from "../universal/CrossDomainMessenger.sol";
 import { L2ToL1MessagePasser } from "./L2ToL1MessagePasser.sol";

packages/contracts-bedrock/contracts/test/CommonTest.t.sol

@@ -13,7 +13,7 @@ import { OptimismPortal } from "../L1/OptimismPortal.sol";
 import { L2ToL1MessagePasser } from "../L2/L2ToL1MessagePasser.sol";
 import { L1CrossDomainMessenger } from "../L1/L1CrossDomainMessenger.sol";
 import { L2CrossDomainMessenger } from "../L2/L2CrossDomainMessenger.sol";
-import { AddressAliasHelper } from "../libraries/AddressAliasHelper.sol";
+import { AddressAliasHelper } from "../vendor/AddressAliasHelper.sol";
 import { OVM_ETH } from "../L2/OVM_ETH.sol";
 import { Lib_PredeployAddresses } from "../libraries/Lib_PredeployAddresses.sol";
 import { ERC20 } from "@openzeppelin/contracts/token/ERC20/ERC20.sol";

packages/contracts-bedrock/contracts/test/L1CrossDomainMessenger.t.sol

@@ -6,7 +6,7 @@ import { Messenger_Initializer } from "./CommonTest.t.sol";
 import { L2OutputOracle_Initializer } from "./L2OutputOracle.t.sol";
 
 /* Libraries */
-import { AddressAliasHelper } from "../libraries/AddressAliasHelper.sol";
+import { AddressAliasHelper } from "../vendor/AddressAliasHelper.sol";
 import { Lib_DefaultValues } from "../libraries/Lib_DefaultValues.sol";
 import { Lib_PredeployAddresses } from "../libraries/Lib_PredeployAddresses.sol";
 import { Lib_CrossDomainUtils } from "../libraries/Lib_CrossDomainUtils.sol";

packages/contracts-bedrock/contracts/test/L1StandardBridge.t.sol

@@ -6,7 +6,7 @@ import { StandardBridge } from "../universal/StandardBridge.sol";
 import { L2StandardBridge } from "../L2/L2StandardBridge.sol";
 import { CrossDomainMessenger } from "../universal/CrossDomainMessenger.sol";
 import { Lib_PredeployAddresses } from "../libraries/Lib_PredeployAddresses.sol";
-import { AddressAliasHelper } from "../libraries/AddressAliasHelper.sol";
+import { AddressAliasHelper } from "../vendor/AddressAliasHelper.sol";
 import { ERC20 } from "@openzeppelin/contracts/token/ERC20/ERC20.sol";
 import { stdStorage, StdStorage } from "forge-std/Test.sol";
 

packages/contracts-bedrock/contracts/test/L2CrossDomainMessenger.t.sol

@@ -4,7 +4,7 @@ pragma solidity 0.8.10;
 import { Messenger_Initializer } from "./CommonTest.t.sol";
 
 import { Lib_CrossDomainUtils } from "../libraries/Lib_CrossDomainUtils.sol";
-import { AddressAliasHelper } from "../libraries/AddressAliasHelper.sol";
+import { AddressAliasHelper } from "../vendor/AddressAliasHelper.sol";
 import { L2ToL1MessagePasser } from "../L2/L2ToL1MessagePasser.sol";
 import { L2OutputOracle } from "../L1/L2OutputOracle.sol";
 import { L2CrossDomainMessenger } from "../L2/L2CrossDomainMessenger.sol";

packages/contracts-bedrock/contracts/test/OptimismPortal.t.sol

@@ -3,7 +3,7 @@ pragma solidity 0.8.10;
 
 import { Portal_Initializer, CommonTest, NextImpl } from "./CommonTest.t.sol";
 
-import { AddressAliasHelper } from "../libraries/AddressAliasHelper.sol";
+import { AddressAliasHelper } from "../vendor/AddressAliasHelper.sol";
 import { L2OutputOracle } from "../L1/L2OutputOracle.sol";
 import { OptimismPortal } from "../L1/OptimismPortal.sol";
 import { WithdrawalVerifier } from "../libraries/Lib_WithdrawalVerifier.sol";