feat(load-balancer): allow specifying health check options in add-service

[phm07]

Closes #742

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 86.44068% with 8 lines in your changes are missing coverage. Please review.

Project coverage is 60.27%. Comparing base (5083734) to head (69d4031).

Files	Patch %	Lines
internal/cmd/loadbalancer/add_service.go	86.44%	5 Missing and 3 partials :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #743      +/-   ##
==========================================
+ Coverage   59.94%   60.27%   +0.32%     
==========================================
  Files         180      180              
  Lines        6509     6568      +59     
==========================================
+ Hits         3902     3959      +57     
- Misses       1987     1989       +2     
  Partials      620      620              

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