Convert CLIs to subcommands in modelarrayio CLI

[tsalo]

The main modelarrayio argument parser is based on BABS's approach.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 76.66667% with 14 lines in your changes missing coverage. Please review.
✅ Project coverage is 50.47%. Comparing base (ce9064a) to head (2405afe).

Files with missing lines	Patch %	Lines
src/modelarrayio/cli/h5_to_cifti.py	40.00%	3 Missing ⚠️
src/modelarrayio/cli/h5_to_mif.py	40.00%	3 Missing ⚠️
src/modelarrayio/cli/h5_to_nifti.py	40.00%	3 Missing ⚠️
src/modelarrayio/cli/main.py	88.46%	2 Missing and 1 partial ⚠️
src/modelarrayio/cli/mif_to_h5.py	81.81%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main      #27       +/-   ##
===========================================
+ Coverage   37.90%   50.47%   +12.56%     
===========================================
  Files          13       14        +1     
  Lines         947      943        -4     
  Branches      135      137        +2     
===========================================
+ Hits          359      476      +117     
+ Misses        561      439      -122     
- Partials       27       28        +1     

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