refactor(rpc): remove transaction_pre_exec API

[googgoog]

Summary

Remove the eth_transactionPreExec RPC API endpoint and all associated code to simplify the RPC module and reduce dependencies.

Motivation

The transaction_pre_exec API was not actively used and added significant complexity to the codebase. Removing it:

• Reduces the codebase by over 1,000 lines
• Removes 11 unused dependencies
• Simplifies maintenance and testing
• Reduces potential attack surface

Changes

Removed Files

• ❌ crates/rpc/src/pre_exec_ext_xlayer.rs (890 lines)
  • PreExec trait and implementations
  • Call frame conversion logic
  • Transaction validation helpers
• ❌ crates/rpc/src/pre_exec_types.rs (147 lines)
  • PreExecResult, PreExecError, PreExecInnerTx types

Modified Files

• ✏️ crates/rpc/src/lib.rs - Remove module declarations
• ✏️ crates/rpc/src/xlayer_ext.rs - Remove transaction_pre_exec method
• ✏️ crates/rpc/Cargo.toml - Remove 11 unused dependencies

Removed Dependencies

• reth-errors, reth-evm, reth-revm
• alloy-eips, alloy-evm, alloy-rpc-types-eth, alloy-rpc-types-trace
• op-alloy-rpc-types
• revm, revm-inspectors, serde_json

Remaining API

The xlayer-rpc crate now only provides:

• ✅ eth_minGasPrice - Returns minimum gas price (base fee + suggested fee)

Testing

• ✅ All tests pass (cargo test -p xlayer-rpc)
• ✅ No compilation warnings
• ✅ Clean build with cargo check

Impact

• Code reduction: -1,139 lines
• Dependency reduction: -11 dependencies
• Breaking change: Yes - removes the eth_transactionPreExec endpoint
  • ⚠️ Any external services calling this endpoint will need to be updated

Checklist

• Tests pass
• No compilation warnings
• Dependencies cleaned up
• Documentation updated (API removed from interface)

[JimmyShi22]

LGTM