Feat: Add parameters for load and save methods of base comparators

[adrien-berchet]

Description

Add some parameters to load() and save() methods of several base comparators and set root=False by default for XmlComparator.save()

Checklist

This pull request is:

• A documentation / typographical error fix
  • Good to go, no issue or tests are needed
• A short code fix
  • Please include: Fixes: #<issue number> in the description if it solves an existing issue
    (which must include a complete example of the issue).
  • Please include tests that fail with the main branch and pass with the provided fix.
• A new feature implementation or update an existing feature
  • Please include: Fixes: #<issue number> in the description if it solves an existing issue
    (which must include a complete example of the feature).
  • Please include tests that cover every lines of the new/updated feature.
  • Please update the documentation to describe the new/updated feature.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (d1a407f) to head (2768f1b).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main       #64   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files            7         7           
  Lines          575       575           
  Branches       117       117           
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  Hits           575       575           

Flag	Coverage Δ
pytest	100.00% <100.00%> (ø)

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Files with missing lines	Coverage Δ
dir_content_diff/base_comparators.py	100.00% <100.00%> (ø)