Improve `eth_*` methods performance

[LesnyRumcajs]

Summary

We've got some numbers on real traffic; for several methods they don't look good and while Forest takes significantly less resources, there should be some room for improvement.

Motivation

Performance and resource usage are the selling points of Forest. There's nothing we can't do in Rust that is done in Golang.

Tasks

• All listed methods should be at least as fast as in Lotus - few times slower is not acceptable
• Ignore debug_traceBlockByNumber and debug_traceTransaction, they were not actually invoked

Risks & Dependencies

Additional Links & Resources