Structural refactoring

[lasuillard]

Lots of backward-incompatible structural changes in overall codebase for extensibility and maintainability of this library.

Changes will be released in 0.3.0 and totally incompatible with previous versions.

• Rewrite codebase
• Write tests
• Update documentation
• Update examples
• Update translations

[codecov]

Codecov Report

Attention: Patch coverage is 95.37037% with 20 lines in your changes missing coverage. Please review.

Project coverage is 97.80%. Comparing base (b2f225a) to head (ea2a7a1).

✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
...o_slack_tools/slack_messages/middlewares/django.py	73.68%	20 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##              main     #104      +/-   ##
===========================================
- Coverage   100.00%   97.80%   -2.20%     
===========================================
  Files           31       41      +10     
  Lines          830      911      +81     
  Branches       106       72      -34     
===========================================
+ Hits           830      891      +61     
- Misses           0       20      +20     

Flag	Coverage Δ
django-4.2	97.80% <95.37%> (-2.20%)	⬇️
django-5.0	97.80% <95.37%> (-2.20%)	⬇️
django-5.1	97.80% <95.37%> (-2.20%)	⬇️
python-3.10	97.80% <95.37%> (-2.20%)	⬇️
python-3.11	97.80% <95.37%> (-2.20%)	⬇️
python-3.12	97.80% <95.37%> (-2.20%)	⬇️
python-3.13	97.80% <95.37%> (-2.20%)	⬇️
python-3.9	97.79% <95.37%> (-2.09%)	⬇️

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