Implement iterwalk for xml.etree.ElementTree

[tefra]

Bring up to speed native xml event handler

• parse from element or tree
• xinclude for XmlEventHandler
• py36-py38 xinclude has no base_url

[codecov]

Codecov Report

Merging #546 (508a93a) into master (a3ccfbf) will decrease coverage by 0.20%.
The diff coverage is 69.23%.

❗ Current head 508a93a differs from pull request most recent head 4c2bf8c. Consider uploading reports for the commit 4c2bf8c to get more accurate results

@@             Coverage Diff             @@
##            master     #546      +/-   ##
===========================================
- Coverage   100.00%   99.79%   -0.21%     
===========================================
  Files           93       93              
  Lines         7767     7794      +27     
  Branches      1337     1343       +6     
===========================================
+ Hits          7767     7778      +11     
- Misses           0       15      +15     
- Partials         0        1       +1     

Impacted Files	Coverage Δ
...sdata/formats/dataclass/parsers/handlers/native.py	82.60% <57.89%> (-17.40%)	⬇️
xsdata/codegen/container.py	100.00% <100.00%> (ø)
xsdata/codegen/handlers/class_name_conflict.py	100.00% <100.00%> (ø)
xsdata/codegen/mappers/definitions.py	100.00% <100.00%> (ø)
xsdata/formats/dataclass/serializers/xml.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