Add nox task to check format

[Jannis-Mittenzwei]

Context

you could easily merge code which had formatting errors so we need an automatic formatting check for this problems

Description

This pull request add an nox task which scans the python files for the correct format and is used as a github workflow to check automatically the code for the correct format

[Nicoretti]

Please always adjust the active GitHub workflows as well as the GitHub workflow templates of the toolbox.

[Nicoretti]

Please update checks template:

exasol.toolbox.templates.checks.yml

Also please add a changelog entry