feat(sdk): remove ICrossChainMessenger (#3244)

Removes the ICrossChainMessenger interface. We don't have a strong
reason to maintain this interface and it introduces complexity to the
process of developing the SDK. With the interface, we are required to
make changes to multiple files when we simply want to change the
CrossChainMessenger class. We are also not maintaing multiple
implementations of the CrossChainMessenger that would make the interface
useful.
Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>

.changeset/lovely-gorillas-destroy.md

+---
+'@eth-optimism/sdk': minor
+---
+
+Removes the ICrossChainMessenger interface to speed up SDK development.

packages/sdk/src/adapters/eth-bridge.ts

 /* eslint-disable @typescript-eslint/no-unused-vars */
-import { ethers, Contract, Overrides, BigNumber } from 'ethers'
+import { ethers, Overrides, BigNumber } from 'ethers'
 import { TransactionRequest, BlockTag } from '@ethersproject/abstract-provider'
-import { predeploys, getContractInterface } from '@eth-optimism/contracts'
+import { predeploys } from '@eth-optimism/contracts'
 import { hexStringEquals } from '@eth-optimism/core-utils'
 
 import {

packages/sdk/src/adapters/standard-bridge.ts

@@ -16,9 +16,9 @@ import { predeploys } from '@eth-optimism/contracts'
 import { getContractInterface } from '@eth-optimism/contracts-bedrock'
 import { hexStringEquals } from '@eth-optimism/core-utils'
 
+import { CrossChainMessenger } from '../cross-chain-messenger'
 import {
   IBridgeAdapter,
-  ICrossChainMessenger,
   NumberLike,
   AddressLike,
   TokenBridgeMessage,
@@ -30,7 +30,7 @@ import { toAddress } from '../utils'
  * Bridge adapter for any token bridge that uses the standard token bridge interface.
  */
 export class StandardBridgeAdapter implements IBridgeAdapter {
-  public messenger: ICrossChainMessenger
+  public messenger: CrossChainMessenger
   public l1Bridge: Contract
   public l2Bridge: Contract
 
@@ -43,7 +43,7 @@ export class StandardBridgeAdapter implements IBridgeAdapter {
    * @param opts.l2Bridge L2 bridge contract.
    */
   constructor(opts: {
-    messenger: ICrossChainMessenger
+    messenger: CrossChainMessenger
     l1Bridge: AddressLike
     l2Bridge: AddressLike
   }) {

packages/sdk/src/interfaces/bridge-adapter.ts

@@ -13,7 +13,7 @@ import {
 } from '@ethersproject/abstract-provider'
 
 import { NumberLike, AddressLike, TokenBridgeMessage } from './types'
-import { ICrossChainMessenger } from './cross-chain-messenger'
+import { CrossChainMessenger } from '../cross-chain-messenger'
 
 /**
  * Represents an adapter for an L1<>L2 token bridge. Each custom bridge currently needs its own
@@ -23,7 +23,7 @@ export interface IBridgeAdapter {
   /**
    * Provider used to make queries related to cross-chain interactions.
    */
-  messenger: ICrossChainMessenger
+  messenger: CrossChainMessenger
 
   /**
    * L1 bridge contract.

packages/sdk/src/interfaces/index.ts

 export * from './bridge-adapter'
-export * from './cross-chain-messenger'
 export * from './l2-provider'
 export * from './types'

packages/sdk/src/interfaces/types.ts

@@ -6,7 +6,7 @@ import {
 import { Signer } from '@ethersproject/abstract-signer'
 import { Contract, BigNumber } from 'ethers'
 
-import { ICrossChainMessenger } from './cross-chain-messenger'
+import { CrossChainMessenger } from '../cross-chain-messenger'
 import { IBridgeAdapter } from './bridge-adapter'
 
 /**
@@ -103,7 +103,7 @@ export interface OEContractsLike {
 export interface BridgeAdapterData {
   [name: string]: {
     Adapter: new (opts: {
-      messenger: ICrossChainMessenger
+      messenger: CrossChainMessenger
       l1Bridge: AddressLike
       l2Bridge: AddressLike
     }) => IBridgeAdapter

packages/sdk/src/utils/contracts.ts

@@ -4,6 +4,7 @@ import { ethers, Contract } from 'ethers'
 
 import { toAddress } from './coercion'
 import { DeepPartial } from './type-utils'
+import { CrossChainMessenger } from '../cross-chain-messenger'
 import {
   OEContracts,
   OEL1Contracts,
@@ -13,7 +14,6 @@ import {
   AddressLike,
   BridgeAdapters,
   BridgeAdapterData,
-  ICrossChainMessenger,
   L2ChainID,
 } from '../interfaces'
 import {
@@ -323,7 +323,7 @@ export const getAllOEContracts = (
  */
 export const getBridgeAdapters = (
   l2ChainId: number,
-  messenger: ICrossChainMessenger,
+  messenger: CrossChainMessenger,
   opts?: {
     overrides?: BridgeAdapterData
   }