Feat: EIP-7966

[haythemsellami]

This PR introduce the eth_sendRawTransactionSync RPC endpoint.
For more details: https://eips.ethereum.org/EIPS/eip-7966

Closes https://github.com/category-labs/category-external/issues/119

[Copilot]

Pull Request Overview

This PR implements EIP-7966 by introducing the eth_sendRawTransactionSync RPC endpoint, which submits a transaction and synchronously waits for its receipt with a configurable timeout. The implementation refactors the existing transaction submission logic into reusable helper functions and adds EIP-7966-specific error codes (4 for timeout, 5 for unready transactions).

Key Changes:

• Adds eth_sendRawTransactionSync method that polls for transaction receipts with timeout support
• Refactors eth_sendRawTransaction into modular functions (validate_and_decode_tx, submit_to_txpool) for code reuse
• Introduces configurable timeout parameters (default: 2s, max: 10s) with CLI arguments

Reviewed Changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 9 comments.

Show a summary per file

File	Description
monad-rpc/src/handlers/eth/txn.rs	Core implementation: adds monad_eth_sendRawTransactionSync with polling logic, refactors transaction validation/submission into helper functions, includes basic validation tests
monad-rpc/src/jsonrpc.rs	Adds EIP-7966 error constructors: tx_sync_timeout() (code 4) and tx_sync_unready() (code 5)
monad-rpc/src/handlers/mod.rs	Registers new eth_sendRawTransactionSync method and wires it to the handler
monad-rpc/src/handlers/resources.rs	Adds timeout configuration fields to MonadRpcResources struct and constructor
monad-rpc/src/cli.rs	Adds CLI arguments for default (2000ms) and max (10000ms) timeout configuration
monad-rpc/src/main.rs	Passes timeout configuration parameters to resources in main and test setup
monad-rpc/src/websocket/handler.rs	Updates test configuration with timeout parameter values

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