Add Plugin Support

[vigneshhari]

Proposed Changes

• Brief of changes made.

Associated Issue

• closes Setup a backend for plugins #2031

ref: coronasafe/docs#18

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

@coronasafe/care-backend-maintainers @coronasafe/care-backend-admins

[codecov]

Codecov Report

Attention: Patch coverage is 94.73684% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 62.56%. Comparing base (51ce81e) to head (55d56da).
Report is 38 commits behind head on develop.

❗ Current head 55d56da differs from pull request most recent head 00b3d78. Consider uploading reports for the commit 00b3d78 to get more accurate results

Files	Patch %	Lines
care/facility/models/file_upload.py	94.73%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #2036      +/-   ##
===========================================
+ Coverage    62.20%   62.56%   +0.36%     
===========================================
  Files          221      223       +2     
  Lines        12204    12283      +79     
  Branches      1742     1752      +10     
===========================================
+ Hits          7591     7685      +94     
+ Misses        4305     4276      -29     
- Partials       308      322      +14     

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