[#820] Add /health endpoint for health check

[yohamta]

Issue: #820

Changes:

• Added /health endpoint
• Updated REST API documentation

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 55.93%. Comparing base (c831612) to head (afc3a0c).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
internal/client/client.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #823   +/-   ##
=======================================
  Coverage   55.93%   55.93%           
=======================================
  Files          73       73           
  Lines        7920     7920           
=======================================
  Hits         4430     4430           
  Misses       3110     3110           
  Partials      380      380           

Files with missing lines	Coverage Δ
internal/client/interface.go	100.00% <ø> (ø)
internal/client/client.go	57.09% <0.00%> (ø)

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