RPC unit testing / regression testing framework

[hanabi1224]

Summary

We currently run RPC parity tests with forest-tool api compare command in CI. However, to reproduce or troubleshoot a failure, we have to use the full snapshot and filter on the method names. It'd be handy to be able to generate a minimal DB snapshot together with request payload and desired response with which we could unit test an RPC method.

We've implemented a PoC demo during the team offsite on https://github.com/ChainSafe/forest/tree/hm/rpc-unit-tests branch. The next step would be converting the demo into formal PRs

Completion Criteria

• RPC test snapshot generation tool #5047
• RPC test snapshot execution tool #5048
• RPC unit tests with a small set of RPC test snapshots that are store on a DigitalOcean space #5049

Additional Links & Resources