handle nii.gz correctly

[alessandrofelder]

Description

What is this PR

• Bug fix
• Addition of a new feature
• Other

Why is this PR needed?

save/load_any in Image IO was raising an error when passed a compressed nifti file (.nii.gz) - (but save/load_nii works with these files perfectly fine).

What does this PR do?

In the save/load_any functions, this PR adds handling the case of compressed nifti files appropriately.

References

Closes #89

How has this PR been tested?

Improved tests, to cover this case, were added and pass locally.

Is this a breaking change?

No

Does this PR require an update to the documentation?

No

Checklist:

• The code has been tested locally
• Tests have been added to cover all new functionality (unit & integration)
• The documentation has been updated to reflect any changes
• The code has been formatted with pre-commit

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.68%. Comparing base (7098eb8) to head (f5eb737).

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #93   +/-   ##
=======================================
  Coverage   92.68%   92.68%           
=======================================
  Files          37       37           
  Lines        1845     1845           
=======================================
  Hits         1710     1710           
  Misses        135      135           

Flag	Coverage Δ
numba	92.62% <100.00%> (ø)

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[adamltyson]

Awesome, thanks! I tested it on a "real" nii.gz file too and it works fine.