Handle substitutions as choice elements

[tefra]

📒 Description

Substitutions should be handled as choice elements.

Resolves #735

🔗 What I've Done

Finally after months of refactor we can now fix this easily 🚀

💬 Comments

A place to write any comments to the reviewer.

🛫 Checklist

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

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.03 🎉

Comparison is base (f4bcb98) 99.93% compared to head (7c0317e) 99.96%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #786      +/-   ##
==========================================
+ Coverage   99.93%   99.96%   +0.03%     
==========================================
  Files         104      104              
  Lines        9092     9102      +10     
  Branches     2032     2035       +3     
==========================================
+ Hits         9086     9099      +13     
+ Partials        6        3       -3     

Impacted Files	Coverage Δ
...ta/codegen/handlers/add_attribute_substitutions.py	100.00% <100.00%> (ø)
...data/codegen/handlers/calculate_attribute_paths.py	100.00% <100.00%> (+5.55%)	⬆️
xsdata/formats/dataclass/parsers/nodes/element.py	100.00% <100.00%> (ø)

... and 1 file with indirect coverage changes

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[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
1 Code Smell

No Coverage information
0.0% Duplication