feat: Healthcheck endpoint

[godexsoft]

This implement a simple endpoint for system healthcheck.

[codecov]

Codecov Report

Attention: Patch coverage is 16.66667% with 5 lines in your changes missing coverage. Please review.

Project coverage is 71.65%. Comparing base (541bf43) to head (40cef49).
Report is 1 commits behind head on develop.

Files with missing lines	Patch %	Lines
src/app/ClioApplication.cpp	0.00%	3 Missing ⚠️
src/etlng/impl/GrpcSource.cpp	0.00%	0 Missing and 1 partial ⚠️
src/web/impl/HttpBase.hpp	50.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1751      +/-   ##
===========================================
- Coverage    71.67%   71.65%   -0.02%     
===========================================
  Files          295      295              
  Lines        12649    12652       +3     
  Branches      6471     6473       +2     
===========================================
  Hits          9066     9066              
- Misses        1871     1873       +2     
- Partials      1712     1713       +1     

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