Use the required metadata flag only for attributes

[tefra]

📒 Description

Since we dropped 3.9, we can finally safely rely on the typing annotation to figure out if a simple element, value are required or not. We only need this metadata for attributes with default values in order to describe if they must always appear in the xml output or not.

🔗 What I've Done

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💬 Comments

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🛫 Checklist

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

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (dca262b) to head (8864597).
⚠️ Report is 5 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #1208      +/-   ##
===========================================
+ Coverage   99.97%   100.00%   +0.02%     
===========================================
  Files         116       116              
  Lines        9364      9376      +12     
  Branches     1433      1439       +6     
===========================================
+ Hits         9362      9376      +14     
+ Misses          1         0       -1     
+ Partials        1         0       -1     

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

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