Stabilize non-blocking RPC feature

This is a sub-milestone of %(2024Q2) - Layer 1 - Public RPC endpoint supporting average 1k RPS and a follow up milestone of %Non-blocking RPC feature as experimental.

This milestone aims to finalize the non-blocking RPC feature so that it is not leaking resource any more. To do so, we propose to wrap streamed RPCs, as proposed in %Non-Blocking RPCs Thanks to this, the leak should be tempered. However, the solution is not satisfying and may require other improvements in follow up projects.

Work breakdown

• (ETA: 2024-05-10) Characterize and quantify the streamed RPCs to wrap
  • Inventory of the streamed RPCs to forward
• (ETA: 2024-05-17) Wrap streamed RPCs to avoid the Cohttp resource leak
  • Implement a generic wrapper
  • Use the generic wrapper on streamed RPCs
  • Implement/reuse a test to confirm the fix
• (ETA: 2024-05-24) Enforce streamed RPC wrapping for the future
  • Enforce the wrapping for streamed RPC or write a "gentleman rule"

• Benefits from the resource leak, avoiding a workaround
  • File descriptor milestone's item