port mutex sample from go repository

[K-Yo]

What was changed

Added a python sample for mutex pattern

Why?

The sample exists for go sdk but not for python yet. I needed it so I figured I could share it.

Checklist

1. TODO

I’ve left a TODO in the code, I am not sure how to properly distinguish who sends a release in python (even if sender workflows are supposed to send them in order)

3. How was this tested:

ran it locally with latest temporal dev server, and using branch pyproject.toml configuration.

4. Any docs updates needed?

not that I think of

[CLAassistant]

All committers have signed the CLA.

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}