Move chat protocol implementation to Go SDK

[pedropombeiro]

Problem

As a developer, I want to move the chat protocol implementation to a separate Go repo so that we realize performance improvements and better architectural separation (e.g. we'd be able to replace the SDK implementation with a mock implementation to test having large sets of data in the react app UI).

Implementation

TODO: Known steps towards feature implementation.
What needs further specifying and investigating.

Acceptance Criteria

Simplified API is available in the Go SDK allowing the react repo to easily consume the chat functionality. There should be no breaking changes or UX changes required.

Notes

TODO: Random notes to keep in mind while implementing it. Mostly about related issues and future plans and thoughts.

Future Steps

• Replace implementation in https://github.com/status-im/status-react