Add enable more ruff rules: isort, pyflakes, pycodestyle

[ericpre]

Progress of the PR

• Enable more ruff rules: isort, pyflakes, pycodestyle,
• [n/a] docstring updated (if appropriate),
• [n/a] update user guide (if appropriate),
• [n/a] added tests,
• add a changelog entry in the upcoming_changes folder (see upcoming_changes/README.rst),
• Check formatting of the changelog entry (and eventual user guide changes) in the docs/readthedocs.org:holospy build of this PR (link in github checks)
• ready for review.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.40%. Comparing base (aeaa107) to head (ad4ef20).

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #37   +/-   ##
=======================================
  Coverage   86.40%   86.40%           
=======================================
  Files           7        7           
  Lines         331      331           
  Branches       74       74           
=======================================
  Hits          286      286           
  Misses         27       27           
  Partials       18       18           

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