fix: move MintableERC721 interface

Moves the interface for the OptimismMintableERC721 into the
SupportedInterfaces file where the rest of the interfaces are.

packages/contracts-bedrock/contracts/L2/L2ERC721Bridge.sol

@@ -4,7 +4,7 @@ pragma solidity 0.8.15;
 import { ERC721Bridge } from "../universal/ERC721Bridge.sol";
 import { ERC165Checker } from "@openzeppelin/contracts/utils/introspection/ERC165Checker.sol";
 import { L1ERC721Bridge } from "../L1/L1ERC721Bridge.sol";
-import { IOptimismMintableERC721 } from "../universal/IOptimismMintableERC721.sol";
+import { IOptimismMintableERC721 } from "../universal/SupportedInterfaces.sol";
 import { Semver } from "../universal/Semver.sol";
 
 /**

packages/contracts-bedrock/contracts/universal/IOptimismMintableERC721.sol

-// SPDX-License-Identifier: MIT
-pragma solidity ^0.8.0;
-
-import {
-    IERC721Enumerable
-} from "@openzeppelin/contracts/token/ERC721/extensions/IERC721Enumerable.sol";
-
-/**
- * @title IOptimismMintableERC721
- * @notice Interface for contracts that are compatible with the OptimismMintableERC721 standard.
- *         Tokens that follow this standard can be easily transferred across the ERC721 bridge.
- */
-interface IOptimismMintableERC721 is IERC721Enumerable {
-    /**
-     * @notice Emitted when a token is minted.
-     *
-     * @param account Address of the account the token was minted to.
-     * @param tokenId Token ID of the minted token.
-     */
-    event Mint(address indexed account, uint256 tokenId);
-
-    /**
-     * @notice Emitted when a token is burned.
-     *
-     * @param account Address of the account the token was burned from.
-     * @param tokenId Token ID of the burned token.
-     */
-    event Burn(address indexed account, uint256 tokenId);
-
-    /**
-     * @notice Mints some token ID for a user, checking first that contract recipients
-     *         are aware of the ERC721 protocol to prevent tokens from being forever locked.
-     *
-     * @param _to      Address of the user to mint the token for.
-     * @param _tokenId Token ID to mint.
-     */
-    function safeMint(address _to, uint256 _tokenId) external;
-
-    /**
-     * @notice Burns a token ID from a user.
-     *
-     * @param _from    Address of the user to burn the token from.
-     * @param _tokenId Token ID to burn.
-     */
-    function burn(address _from, uint256 _tokenId) external;
-
-    /**
-     * @notice Chain ID of the chain where the remote token is deployed.
-     */
-    function REMOTE_CHAIN_ID() external view returns (uint256);
-
-    /**
-     * @notice Address of the token on the remote domain.
-     */
-    function REMOTE_TOKEN() external view returns (address);
-
-    /**
-     * @notice Address of the ERC721 bridge on this network.
-     */
-    function BRIDGE() external view returns (address);
-
-    /**
-     * @notice Chain ID of the chain where the remote token is deployed.
-     */
-    function remoteChainId() external view returns (uint256);
-
-    /**
-     * @notice Address of the token on the remote domain.
-     */
-    function remoteToken() external view returns (address);
-
-    /**
-     * @notice Address of the ERC721 bridge on this network.
-     */
-    function bridge() external view returns (address);
-}

packages/contracts-bedrock/contracts/universal/OptimismMintableERC721.sol

@@ -7,7 +7,7 @@ import {
 import { ERC721 } from "@openzeppelin/contracts/token/ERC721/ERC721.sol";
 import { IERC165 } from "@openzeppelin/contracts/utils/introspection/IERC165.sol";
 import { Strings } from "@openzeppelin/contracts/utils/Strings.sol";
-import { IOptimismMintableERC721 } from "./IOptimismMintableERC721.sol";
+import { IOptimismMintableERC721 } from "./SupportedInterfaces.sol";
 
 /**
  * @title OptimismMintableERC721

packages/contracts-bedrock/contracts/universal/SupportedInterfaces.sol

@@ -3,6 +3,9 @@ pragma solidity ^0.8.0;
 
 // Import this here to make it available just by importing this file
 import { IERC165 } from "@openzeppelin/contracts/utils/introspection/IERC165.sol";
+import {
+    IERC721Enumerable
+} from "@openzeppelin/contracts/token/ERC721/extensions/IERC721Enumerable.sol";
 
 /**
  * @title IOptimismMintableERC20
@@ -33,3 +36,73 @@ interface ILegacyMintableERC20 {
 
     function burn(address _from, uint256 _amount) external;
 }
+
+/**
+ * @title IOptimismMintableERC721
+ * @notice Interface for contracts that are compatible with the OptimismMintableERC721 standard.
+ *         Tokens that follow this standard can be easily transferred across the ERC721 bridge.
+ */
+interface IOptimismMintableERC721 is IERC721Enumerable {
+    /**
+     * @notice Emitted when a token is minted.
+     *
+     * @param account Address of the account the token was minted to.
+     * @param tokenId Token ID of the minted token.
+     */
+    event Mint(address indexed account, uint256 tokenId);
+
+    /**
+     * @notice Emitted when a token is burned.
+     *
+     * @param account Address of the account the token was burned from.
+     * @param tokenId Token ID of the burned token.
+     */
+    event Burn(address indexed account, uint256 tokenId);
+
+    /**
+     * @notice Mints some token ID for a user, checking first that contract recipients
+     *         are aware of the ERC721 protocol to prevent tokens from being forever locked.
+     *
+     * @param _to      Address of the user to mint the token for.
+     * @param _tokenId Token ID to mint.
+     */
+    function safeMint(address _to, uint256 _tokenId) external;
+
+    /**
+     * @notice Burns a token ID from a user.
+     *
+     * @param _from    Address of the user to burn the token from.
+     * @param _tokenId Token ID to burn.
+     */
+    function burn(address _from, uint256 _tokenId) external;
+
+    /**
+     * @notice Chain ID of the chain where the remote token is deployed.
+     */
+    function REMOTE_CHAIN_ID() external view returns (uint256);
+
+    /**
+     * @notice Address of the token on the remote domain.
+     */
+    function REMOTE_TOKEN() external view returns (address);
+
+    /**
+     * @notice Address of the ERC721 bridge on this network.
+     */
+    function BRIDGE() external view returns (address);
+
+    /**
+     * @notice Chain ID of the chain where the remote token is deployed.
+     */
+    function remoteChainId() external view returns (uint256);
+
+    /**
+     * @notice Address of the token on the remote domain.
+     */
+    function remoteToken() external view returns (address);
+
+    /**
+     * @notice Address of the ERC721 bridge on this network.
+     */
+    function bridge() external view returns (address);
+}