[Instrumented libraries] Add .style.yapf

This will ensure `git cl format` will format changed python files.
This CL also manually runs `yapf --style=pep8` on existing files.

R=thestig

Change-Id: Ic476e9aa7df39a1754fa40a241a0550ef877eb88
Bug: 1496000
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5009331
Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Thomas Anderson <thomasanderson@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1220731}
NOKEYCHECK=True
GitOrigin-RevId: f522e702d09d4a0d9663624249d3019eb77cc08b
4 files changed