feat: Move the protobuf RPC implementation into it's own package

[adityapk00]

What is the feature you would like to implement? Move the RPC service definition and implementation out of `packages/protobufs into it's own package

Why is this feature important? Right now, the packages/protobufs contains both the proto definitions and the gRPC service definitions, which bring in grpc-js. It would be nice to have the protobufs package to just contain the protobuf definitions, which will make it easier for clients to depend on instead of pulling in all the grpc dependencies.

Will the protocol spec need to be updated?? No

How should this feature be built? (optional)

Additional context