[Github Actions] Configure a workflow for running unit tests and static code analysis

[shobhitagarwal1612]

Towards #2670

Things done:

• Triggers a github action on every pull request on master or push to master
• Runs unit tests and static code analysis checks
• Also enables gradle caching

@gino-m PTAL?

[gino-m]

That was quick! One comment.

[gino-m]

Naming nits incoming!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 61.19%. Comparing base (b3ccb90) to head (4ea0312).
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #2671   +/-   ##
=========================================
  Coverage     61.19%   61.19%           
  Complexity     1187     1187           
=========================================
  Files           262      262           
  Lines          6041     6041           
  Branches        826      826           
=========================================
  Hits           3697     3697           
  Misses         1882     1882           
  Partials        462      462           

Flag	Coverage Δ
service	61.19% <ø> (ø)

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[shobhitagarwal1612]

@gino-m Can you add the codecov token to project secrets? I don't have access to add it.

[gino-m]

🏅 !!