Python 3.10 Support

[madpah]

Python 3.10 officially released on 09-Nov-2021 - support for this should be included / verified.

[jkowalleck]

acc crit:

• have CI/CT running in py3.10 - and pass
• have tox tunning in py3.10 = and pass
• added the py3.10 trove / classifier "Programming Language :: Python :: 3.10"