feat: CU-86934hnmg rest api skipping fields

[CodeVoyager]

Ticket

https://github.com/VirtusLab-Open-Source/strapi-plugin-comments/issues/239

Summary

What does this PR do/solve?

• fields of comment entity can be skipped

Test Plan

• start the server
• make a API call like http://localhost:1337/api/comments/<id>?omit[]=blocked&omit[]=related&omit[]=author
• response should not contain specified fields

[cyp3rius]

Task linked: CU-86934hnmg Make related not mandatory population

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 92.30769% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 80.90%. Comparing base (2a49049) to head (cd39582).

Files	Patch %	Lines
server/services/common.ts	91.66%	1 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #252      +/-   ##
==========================================
- Coverage   80.97%   80.90%   -0.08%     
==========================================
  Files          35       35              
  Lines         946      953       +7     
  Branches      316      321       +5     
==========================================
+ Hits          766      771       +5     
- Misses        176      178       +2     
  Partials        4        4              

Flag	Coverage Δ
unittest	80.90% <92.30%> (-0.08%)	:arrow_down:

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