Implement /healthz resource

[mazay]

Description

Adding a new HTTP resource /healthz for k8s health checks, that do not spam logs. Fixes #603.

Type of change

• Bug fix
• New feature
• Breaking change
• Documentation update
• CI update/change

Pre-flight checklist

• I have performed a self-review of my code
• The change is covered by tests
• The documentation is updated accordingly
• PR label set

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 35.35%. Comparing base (80bb864) to head (c467508).
Report is 30 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #945      +/-   ##
==========================================
+ Coverage   35.27%   35.35%   +0.08%     
==========================================
  Files           9        9              
  Lines         774      775       +1     
==========================================
+ Hits          273      274       +1     
  Misses        481      481              
  Partials       20       20              

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