Project: Replace WebSockets and TCP with gRPC

[emilk]

Summary description

Replace our current use of TCP and WebSocket communications with gRPC.

Background and problem

We want to unify all communication to a single protocol.

Grounding use-cases

🤷

How to describe, demo and evaluate

A demo would be to spin up a gRPC server in one terminal, connect to it with a web-viewer, and then to log to the server from the logging SDK.

It should run as well as the current solution.

Designs and plans

• https://www.notion.so/rerunio/gRPC-Architecture-143b24554b198039b3badfad37e2d171?pvs=4
• https://www.notion.so/rerunio/Protobufication-143b24554b19803e83acd5cc34bd5219?pvs=4

Tasks

• Implement re_grpc_server #8451
• Implement a gRPC log sink in the SDK
• Test end-to-end
• Replace existing TCP and WebSocket connections with the new stuff

Non-goals and won't do

Things we're doing later:

• Two-way communication over gRPC (e.g. catalogue listing)
• Replace enum LogMsg