Remove some unused code

.changeset/few-boxes-pull.md

@@ -0,0 +1,5 @@
+---
+'@eth-optimism/contracts': patch
+---
+
+Remove unused gas testing utils

packages/contracts/contracts/libraries/bridge/Lib_CrossDomainUtils.sol

@@ -1,9 +1,6 @@
 // SPDX-License-Identifier: MIT
 pragma solidity ^0.8.9;
 
-/* Library Imports */
-import { Lib_RLPReader } from "../rlp/Lib_RLPReader.sol";
-
 /**
  * @title Lib_CrossDomainUtils
  */

packages/contracts/docs/Initializable.md

@@ -6,7 +6,7 @@
 
 
 
-*This is a base contract to aid in writing upgradeable contracts, or any kind of contract that will be deployed behind a proxy. Since a proxied contract can't have a constructor, it's common to move constructor logic to an external initializer function, usually called `initialize`. It then becomes necessary to protect this initializer function so it can only be called once. The {initializer} modifier provided by this contract will have this effect. TIP: To avoid leaving the proxy in an uninitialized state, the initializer function should be called as early as possible by providing the encoded function call as the `_data` argument to {ERC1967Proxy-constructor}. CAUTION: When used with inheritance, manual care must be taken to not invoke a parent initializer twice, or to ensure that all initializers are idempotent. This is not verified automatically as constructors are by Solidity.*
+*This is a base contract to aid in writing upgradeable contracts, or any kind of contract that will be deployed behind a proxy. Since a proxied contract can't have a constructor, it's common to move constructor logic to an external initializer function, usually called `initialize`. It then becomes necessary to protect this initializer function so it can only be called once. The {initializer} modifier provided by this contract will have this effect. TIP: To avoid leaving the proxy in an uninitialized state, the initializer function should be called as early as possible by providing the encoded function call as the `_data` argument to {ERC1967Proxy-constructor}. CAUTION: When used with inheritance, manual care must be taken to not invoke a parent initializer twice, or to ensure that all initializers are idempotent. This is not verified automatically as constructors are by Solidity. [CAUTION] ==== Avoid leaving a contract uninitialized. An uninitialized contract can be taken over by an attacker. This applies to both a proxy and its implementation contract, which may impact the proxy. To initialize the implementation contract, you can either invoke the initializer manually, or you can include a constructor to automatically mark it as initialized when it is deployed: [.hljs-theme-light.nopadding] ```*
 
 
 

packages/contracts/test/helpers/index.ts

@@ -5,4 +5,3 @@ export * from './utils'
 export * from './codec'
 export * from './test-runner'
 export * from './trie'
-export * from './gas'