convert image validator aspect ratio to list

[sainak]

Proposed Changes

• convert image validator aspect ratio to list
• add tests

Merge Checklist

• Tests added/fixed
• Update docs in /docs
• Linting Complete
• Any other necessary step

Only PR's with test cases included and passing lint and test pipelines will be reviewed

@ohcnetwork/care-backend-maintainers @ohcnetwork/care-backend-admins

[codecov]

Codecov Report

Attention: Patch coverage is 92.30769% with 1 line in your changes missing coverage. Please review.

Project coverage is 65.19%. Comparing base (664739e) to head (2de36a0).
Report is 1 commits behind head on develop.

Files with missing lines	Patch %	Lines
care/utils/models/validators.py	92.30%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #2475      +/-   ##
===========================================
+ Coverage    64.82%   65.19%   +0.37%     
===========================================
  Files          242      242              
  Lines        13858    13865       +7     
  Branches      1920     1925       +5     
===========================================
+ Hits          8983     9039      +56     
+ Misses        4497     4448      -49     
  Partials       378      378              

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[bodhish]

LGTM;