Add compression support to Forest RPC server

[hanabi1224]

Summary

An F3 sidecar uses the hosting Forest node as EC backend via RPC calls, we could reduce response size and latency of the RPC calls by using content compression.

Completion Criteria

• Forest RPC server should support Accept-Encoding header (e.g. Accept-Encoding: gzip, deflate, compress, br, zstd) and respond with Content-Encoding header. (e.g. Content-Encoding: br)
• RPC client in f3-sidecar should request content compression by sending Accept-Encoding header
  confirmed that http.client sets Accept-Encoding: gzip and decodes gzipped response automatically
• Consider using content compression in RPC parity tests

Additional Links & Resources

https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Accept-Encoding
https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Encoding