[3.14] gh-133551: Support t-strings in annotationlib (GH-133553) (#133628)

gh-133551: Support t-strings in annotationlib (GH-133553)

I don't know why you'd use t-strings in annotations, but now if you do,
the STRING format will do a great job of recovering the source code.
(cherry picked from commit 90f476e0f8dbb3a8603f67200c2422fb098c166c)

Co-authored-by: Jelle Zijlstra <jelle.zijlstra@gmail.com>