[native] add CommRustModule spec

Summary:
ENG-4232

Creating a separate module for Rust API. This is a part of CommCoreModule refactor.

Introducing TurboModule Spec.

Test Plan: Tested later in the stack.

Reviewers: bartek, michal, tomek, varun

Reviewed By: bartek

Subscribers: ashoat

Differential Revision: https://phab.comm.dev/D8655