django-unpoly-18 Cleanup and Django 4 Support

[jwaschkau]

• added Server side attributes
• added Django 4.X to poetry
• added is_unpoly to requests
• added layer to form attributes
• added success_url to forms

[codecov]

Codecov Report

Base: 0.00% // Head: 0.00% // No change to project coverage 👍

Coverage data is based on head (6366a05) compared to base (31b4afc).
Patch coverage: 0.00% of modified lines in pull request are covered.

Additional details and impacted files

@@          Coverage Diff          @@
##            main     #19   +/-   ##
=====================================
  Coverage   0.00%   0.00%           
=====================================
  Files          5       5           
  Lines         95     118   +23     
=====================================
- Misses        95     118   +23     

Impacted Files	Coverage Δ
django_unpoly/middleware.py	0.00% <0.00%> (ø)
django_unpoly/up.py	0.00% <0.00%> (ø)

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