Add commands and docs for loading dummy data

[sainak]

Proposed Changes

• add make target to load dummy data for docker
• load dummy data on postcreate devcontainer
• add docs for loading dummy data

Associated Issue

• closes Document the processing of loading dummy data for development #1681

Architecture changes

• Remove this section if not used

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

All modified lines are covered by tests ✅

Comparison is base (7d2a033) 60.01% compared to head (64f8570) 60.01%.
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1682   +/-   ##
=======================================
  Coverage   60.01%   60.01%           
=======================================
  Files         208      208           
  Lines       11318    11318           
  Branches     1606     1606           
=======================================
  Hits         6793     6793           
  Misses       4301     4301           
  Partials      224      224           

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