fix single dimension index when requested as a returned dim

[toloudis]

Fixes #435

Now you can do both of:

im_read.get_image_data("CYX", C=[0], T=0, Z=0)

and

im_read.get_image_data("CYX", C=0, T=0, Z=0)

Both will now return a 3d array (assuming the data validly has at least CYX dims, of course)
Where before, passing a single C selection and at the same time requesting C in the returned dims was an error.

[codecov-commenter]

Codecov Report

Base: 86.95% // Head: 86.95% // No change to project coverage 👍

Coverage data is based on head (f40c161) compared to base (0d46966).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #438   +/-   ##
=======================================
  Coverage   86.95%   86.95%           
=======================================
  Files          46       46           
  Lines        4001     4001           
=======================================
  Hits         3479     3479           
  Misses        522      522           

Impacted Files	Coverage Δ
aicsimageio/tests/test_transforms.py	99.00% <ø> (ø)
aicsimageio/transforms.py	99.01% <100.00%> (ø)

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[toloudis]

oops I didn't run all tests locally.. I'll fix them in next commit.

[toloudis]

tests should be ok now

[AetherUnbound]

LGTM!

[evamaxfield]

Nice work!

[guiwitz]

Thanks a lot for fixing this!

[evamaxfield]

Unfortunately it won't be released for a bit. There are a few other PRs in progress to get shipped too.