Add support for custom decorators and base classes

[tefra]

📒 Description

Add configuration to extend generated models by adding custom base classes and decorators

Resolves #xxxx

🔗 What I've Done

Write a description of the steps taken to resolve the issue

💬 Comments

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🛫 Checklist

• Updated docs
• Added unit-tests
• Sample tests pass
• W3C tests pass

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (5eaf612) 99.96% compared to head (b1eb27e) 99.96%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #793   +/-   ##
=======================================
  Coverage   99.96%   99.96%           
=======================================
  Files         104      104           
  Lines        9138     9204   +66     
  Branches     2046     2060   +14     
=======================================
+ Hits         9135     9201   +66     
  Partials        3        3           

Impacted Files	Coverage Δ
xsdata/formats/dataclass/filters.py	99.75% <100.00%> (+0.02%)	⬆️
xsdata/models/config.py	100.00% <100.00%> (ø)

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[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.0% Duplication

[tlambert03]

very excited for this feature. thank you!

Any estimate on when you'll be releasing the next version?