Add option to modify interpolation when inverting

[fepegar]

Resolves #410.

Description
See #410.

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
• If the PR is ready and there are multiple commits, I have squashed them and force-pushed

[codecov]

Codecov Report

Merging #418 (6827698) into master (e83024c) will increase coverage by 0.05%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #418      +/-   ##
==========================================
+ Coverage   92.35%   92.41%   +0.05%     
==========================================
  Files         126      128       +2     
  Lines        6230     6496     +266     
==========================================
+ Hits         5754     6003     +249     
- Misses        476      493      +17     

Impacted Files	Coverage Δ
tests/transforms/test_invertibility.py	100.00% <100.00%> (ø)
torchio/data/subject.py	96.57% <100.00%> (+0.09%)	⬆️
...preprocessing/intensity/normalization_transform.py	91.30% <0.00%> (-2.45%)	⬇️
torchio/transforms/__init__.py	100.00% <0.00%> (ø)
torchio/transforms/preprocessing/__init__.py	100.00% <0.00%> (ø)
...hio/transforms/preprocessing/label/remap_labels.py	100.00% <0.00%> (ø)
...ransforms/preprocessing/label/sequential_labels.py	100.00% <0.00%> (ø)
torchio/transforms/preprocessing/label/one_hot.py	33.33% <0.00%> (ø)
.../transforms/preprocessing/label/label_transform.py	100.00% <0.00%> (ø)
...s/augmentation/intensity/random_labels_to_image.py	96.00% <0.00%> (+0.29%)	⬆️
... and 2 more

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