Added per-image metadata support to ImageInterface

[h-mayorquin]

This will allow users to specify individual resolution (pixels/cm), name and description for each image through metadata structure.

[pauladkisson]

Metadata structure and tests look great! Can you add an updated example to the entry for image in the conversion gallery?

[h-mayorquin]

Metadata structure and tests look great! Can you add an updated example to the entry for image in the conversion gallery?

Yes, good idea.

[h-mayorquin]

Metadata structure and tests look great! Can you add an updated example to the entry for image in the conversion gallery?

Done.

[pauladkisson]

Looks great, thanks @h-mayorquin!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.15%. Comparing base (ffc4f1f) to head (df98673).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1441      +/-   ##
==========================================
+ Coverage   87.14%   87.15%   +0.01%     
==========================================
  Files         145      145              
  Lines        9635     9643       +8     
==========================================
+ Hits         8396     8404       +8     
  Misses       1239     1239              

Flag	Coverage Δ
unittests	87.15% <100.00%> (+0.01%)	⬆️

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Files with missing lines	Coverage Δ
...c/neuroconv/datainterfaces/image/imageinterface.py	90.22% <100.00%> (+0.62%)	⬆️

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