[lib] Update threads-state-sync-spec to use more general RawThreadInfo[s]

Summary:
Updated types related to thread state sync spec to handle RawThreadInfo[s] instead of more specific LegacyRawThreadInfo[s].

Depends on D10212

Test Plan: Flow/CI/etc. Will test state sync + set breakpoints to ensure that behavior continues to be as expected.

Reviewers: ashoat, ginsu, tomek, rohan

Reviewed By: rohan

Differential Revision: https://phab.comm.dev/D10223