Improve gRPC rpc service generation

[achingbrain]

In order to implement bidirectional streaming in the gRPC server and client we mix @improbable-eng/grpc on the client and @grpc/grpc on the server with protobuf -> json generation handled by protobuf.js in the protocol module.

We have load-serivces.js files in both the client and the server which turn the json generated from the protobuf files into data structures used by @improbable-eng/grpc and @grpc/grpc but really we should be passing js stubs generated by protobuf.js instead of the json - this would let us use the types generated from the protobuf files and also means we can use the smaller minimal protobuf.js distribution instead of the light version - 6.5kb vs 16kb - https://www.npmjs.com/package/protobufjs#distributions

protobuf.js can generate server/client stubs for gRPC rpc APIs but currently only for unary calls. protobufjs/protobuf.js#1115 adds support for client/server/bidirectional streaming code/type gen - this needs to be landed somehow, then we can change our stub generation to output js+d.ts instead of json and remove the load-services.js files.

[SgtPooki]

js-ipfs is being deprecated in favor of Helia. You can #4336 and read the migration guide.

Please feel to reopen with any comments by 2023-06-02. We will do a final pass on reopened issues afterward (see #4336).

Leaving open for you to handle Alex.

[achingbrain]

Not planned for js-ipfs