bin/pick-ui: Add a new maintainer script for picking patches

In the long term the goal of this script is to nearly completely
automate the process of picking stable nominations, in a well tested
way.

In the short term the goal is to provide a better, faster UI to interact
with stable nominations.

Reviewed-by: Eric Engestrom <eric@engestrom.ch>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/3608>
5 files changed