Provide init_kwargs to every transform within another transform

[nicoloesch]

Fixes #1223.

Description

Certain transforms utilise already implemented transforms during their apply_transform method. However, these transforms are instantiated without the original arguments passed to the outer transform. These mainly include copy but may also extend to include, exclude, p etc.

This commit appends the initial arguments to each new instantiation of a base transform to reflect the user preference.

Checklist

• I have read the CONTRIBUTING docs and have a developer setup (especially important are pre-commitand pytest)
• Non-breaking change (would not break existing functionality)
• Breaking change (would cause existing functionality to change)
• Tests added or modified to cover the changes
• Integration tests passed locally by running pytest
• In-line docstrings updated
• Documentation updated, tested running make html inside the docs/ folder
• This pull request is ready to be reviewed

[codecov]

Codecov Report

Attention: Patch coverage is 97.36842% with 1 line in your changes missing coverage. Please review.

Project coverage is 84.81%. Comparing base (cfc8aaf) to head (c4737c7).

Files with missing lines	Patch %	Lines
src/torchio/transforms/transform.py	87.50%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1228      +/-   ##
==========================================
- Coverage   87.39%   84.81%   -2.59%     
==========================================
  Files          92       92              
  Lines        6023     6039      +16     
==========================================
- Hits         5264     5122     -142     
- Misses        759      917     +158     

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[fepegar]

Thanks, @nicoloesch! Could you please just add an explanation of what get_base_args does/why it exists in Transform.get_base_args? Just so our future selves or other maintainers have some context about it. I'll approve and merge after that.

[nicoloesch]

@fepegar I added a docstring description to the method. I hope it is detailed enough!