Run unit tests and CI script

[MahirAbbas]

Created a script that runs CI and Unit tests locally.
Fixes #548
Fixes half of #492

Also adds devcontainer-lock.json to .gitignore

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 47.86%. Comparing base (a936eac) to head (c7bce95).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #546   +/-   ##
=======================================
  Coverage   47.86%   47.86%           
=======================================
  Files          95       95           
  Lines        7673     7673           
  Branches      669      669           
=======================================
  Hits         3673     3673           
  Misses       3808     3808           
  Partials      192      192           

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[Ohisemega]

Thanks, Mahir! This is a great utility script for development