[lib] Naively update threadInfoFromRawThreadInfo to support RawThreadInfo argument

Summary:
This will definitely be tidied up in subsequent diff or after rebasing... but this unblocks some keyserver work that I wanted to go ahead and put up ASAP.

Depends on D10284

Test Plan: CI/flow/etc.

Reviewers: ashoat, ginsu, tomek, rohan

Reviewed By: ashoat

Differential Revision: https://phab.comm.dev/D10285