Add python 3.11 to tox testing

[blisabda]

• Update ci.yml add python 3.11

• Update tox.ini with Python 3.11

• Update tox.ini with envlist 3.11

• Update setup.py to enlist as Python 3.11 library

[n1ngu]

In setup.py there is a list of classifiers that are useful to search package metadata in pypi.org

See https://pypi.org/classifiers/

I think it would be nice to add "Programming Language :: Python :: 3.11" in this PR as well!

[tarekziade]

Thanks!