feat: Compat with cms page content extension changes

[marksweb]

This brings compatibility for the current cms v4 setup and the changes I've introduced with;

https://github.com/django-cms/django-cms/pull/7369

And I've included some basic pre-commit hooks for linters to help avoid issues at the point of github actions.

This probably wants to come in with a major version bump

[codecov[bot]]

Codecov Report

Merging #291 (4389dce) into master (914cd32) will decrease coverage by 2.26%. The diff coverage is 50.00%.

:exclamation: Current head 4389dce differs from pull request most recent head 532e99f. Consider uploading reports for the commit 532e99f to get more accurate results

@@            Coverage Diff             @@
##           master     #291      +/-   ##
==========================================
- Coverage   86.39%   84.12%   -2.27%     
==========================================
  Files          23       23              
  Lines         801      838      +37     
  Branches      118      117       -1     
==========================================
+ Hits          692      705      +13     
- Misses         82      107      +25     
+ Partials       27       26       -1     

Impacted Files	Coverage Δ
djangocms_versioning/monkeypatch/page.py	61.11% <45.83%> (-10.69%)	:arrow_down:
djangocms_versioning/monkeypatch/extensions.py	57.35% <53.33%> (-10.04%)	:arrow_down:

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[marksweb]

That check failure can't be avoided. The extra code is going to make the coverage drop, but I guess it's a temporary change.