[DOP-9645] - Add XML file format

[maxim-lixakov]

Change Summary

• Add XML file format, based on https://github.com/databricks/spark-xml. Supports only Spark 3.x.
• Add unit and integration tests
• Add class documentation

Related issue number

Checklist

• Commit message and PR title is comprehensive
• Keep the change as small as possible
• Unit and integration tests for the changes exist
• Tests pass on CI and coverage does not decrease
• Documentation reflects the changes where applicable
• docs/changelog/next_release/<pull request or issue id>.<change type>.rst file added describing change
  (see CONTRIBUTING.rst for details.)
• My PR is ready to review.

[codecov]

Codecov Report

Merging #163 (52d600f) into develop (32c37ed) will increase coverage by 0.01%.
The diff coverage is 96.07%.

@@             Coverage Diff             @@
##           develop     #163      +/-   ##
===========================================
+ Coverage    94.33%   94.34%   +0.01%     
===========================================
  Files          209      210       +1     
  Lines         7925     7976      +51     
  Branches      1490     1500      +10     
===========================================
+ Hits          7476     7525      +49     
- Misses         326      327       +1     
- Partials       123      124       +1     

Files	Coverage Δ
onetl/file/format/__init__.py	100.00% <100.00%> (ø)
onetl/file/format/xml.py	96.00% <96.00%> (ø)