[lib] Introduce raw thread info validators

Summary:
Adds validators for RawThreadInfo and nested types. The example thread info in tests is taken from the app but it's cut a bit so it's shorter.

Depends D7567

Test Plan: Run yarn jest

Reviewers: kamil, inka, tomek

Reviewed By: tomek

Subscribers: ashoat, atul

Differential Revision: https://phab.comm.dev/D7569