feat: Use the event writer to build element trees

[tefra]

📒 Description

The first impl was a disaster, because I thought the treebuilders from lxml and native python, could deal with sax events out of the box, but that wasn't the case. I had to reuse the EventContent handler we use for normal xml serialization in order to get a consistent output.

Unfortunately because of limitations with the python's ElementTree with namespaces and prefixes, the TreeSerializer only works with lxml.

Resolves #1028

🔗 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 99.96%. Comparing base (eab6bb7) to head (510b2b9).

Additional details and impacted files

@@             Coverage Diff             @@
##              main    #1032      +/-   ##
===========================================
- Coverage   100.00%   99.96%   -0.04%     
===========================================
  Files          117      115       -2     
  Lines         9272     9264       -8     
  Branches      2194     2190       -4     
===========================================
- Hits          9272     9261      -11     
- Misses           0        2       +2     
- Partials         0        1       +1     

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[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

See analysis details on SonarCloud