Add Plug Config API

[vigneshhari]

Added new API for Plug Config management in the FE

[codecov]

Codecov Report

Attention: Patch coverage is 62.79070% with 16 lines in your changes missing coverage. Please review.

Project coverage is 70.13%. Comparing base (69c2b83) to head (1888f50).
Report is 3 commits behind head on develop.

Files with missing lines	Patch %	Lines
care/users/api/viewsets/plug_config.py	53.12%	15 Missing ⚠️
care/users/models.py	80.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #2574      +/-   ##
===========================================
+ Coverage    70.03%   70.13%   +0.10%     
===========================================
  Files          198      200       +2     
  Lines        11674    11717      +43     
  Branches      1607     1187     -420     
===========================================
+ Hits          8176     8218      +42     
- Misses        3107     3123      +16     
+ Partials       391      376      -15     

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