Improve RPC and websocket

[trinhdn2]

There are some performance and ultility updates for rpc/websocket that need to be applied to be more stable and usable. The details are in each following PRs

• [ ] https://github.com/BuildOnViction/tomochain/pull/401
• [ ] https://github.com/BuildOnViction/tomochain/pull/402
• [ ] https://github.com/BuildOnViction/tomochain/pull/404
• [ ] https://github.com/BuildOnViction/tomochain/pull/405
• [ ] https://github.com/BuildOnViction/tomochain/pull/406