[Session] Adding the Relay type

[Olshansk]

Summary

Scaffolding & adding the Relay type

Summary generated by Reviewpad on 11 Oct 23 18:07 UTC

This pull request includes the following changes:

1. In the go.mod file, the dependency google.golang.org/genproto has been removed from the require section.
2. In the go.mod file, the dependency google.golang.org/genproto has been added to the require section.
3. A new file named relay.proto has been added in the proto/pocket/service directory. This file contains protobuf message definitions related to relaying requests and responses.
4. The relay.proto file imports other protobuf files and defines message structures for relay requests, relay responses, and their metadata. It also includes definitions for JSON-RPC request and response payloads, REST request payloads, and REST response payloads.

Please review these changes and provide any necessary feedback.

Issue

Part of #10

Type of change

Select one or more:

• New feature, functionality or library
• Bug fix
• Code health or cleanup
• Documentation
• Other (specify)

Testing

• Run all unit tests: make test_all_unit
• Verify Localnet manually: See the instructions [here](TODO: add link to instructions)

Sanity Checklist

• I have tested my changes using the available tooling
• I have performed a self-review of my own code
• I have commented my code, updated documentation and left TODOs throughout the codebase

[Olshansk]

@bryanchriswhite @red-0ne This isn't ready to be merged in, but I think it's close and would really appreciate your feedback on the first iteration of its design.

[red-0ne]

I believe we could have a better categorization of the different properties that would allow for more extensibility too.

I propose something along the following:

RelayRequestMetadata {
  session_header
  signature
}

RelayRequest {
  RelayRequestMetadata meta
  oneof payload {
    JSONRPCRequestPayload ...
    RESTRequestPayload ...
  }
}

RelayResponseMetadata {
  session_header
  supplier_signature
}

RelayResponse {
  RelayResponseMetadata meta
  oneof payload {
    JSONRPCResponsePayload ...
    RESTResponsePayload ...
  }
}

Then each payload would be in terms of request/reply x RPCType

[red-0ne]

This feels great! Just left a question regarding JSONRPCResponsePayload

[red-0ne]

Perfect!