Add Readiness and Liveness probes

[clamoriniere1A]

• Add HTTP server in the workflow controller process which server the readiness and liveness probes.
• Readiness probe checks that the controller caches are fully synced.
• Liveness probe returns always true.

Issue: #45

[codecov-io]

Codecov Report

Merging #46 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #46   +/-   ##
=======================================
  Coverage   39.48%   39.48%           
=======================================
  Files           9        9           
  Lines         851      851           
=======================================
  Hits          336      336           
  Misses        489      489           
  Partials       26       26

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