feat: custom fields on server-side [CU-xhcmx-63]

[CodeVoyager]

Ticket

https://app.clickup.com/30978717/v/b/xhcmx-63

Summary

• Server side handling of filtering by parameters that can be found in newly added comments custom field
• tests expand
• including JS test suites
• fixes for failing tests

Test Plan

Perform calls like:

• http://localhost:1337/api/comments/api::page.page:5/flat?filterBy=DATE_CREATED&filterByValue=2022-10-12T13:21:13.595Z
• http://localhost:1337/api/comments/api::page.page:5/flat?filterBy=APPROVAL_STATUS&filterByValue=APPROVED

[codecov-commenter]

Codecov Report

Merging #161 (126e45a) into develop (3d8b995) will increase coverage by 0.32%. The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           develop     #161      +/-   ##
===========================================
+ Coverage    79.46%   79.79%   +0.32%     
===========================================
  Files           31       33       +2     
  Lines          823      861      +38     
  Branches       273      282       +9     
===========================================
+ Hits           654      687      +33     
- Misses         166      171       +5     
  Partials         3        3              

Flag	Coverage Δ
unittest	79.79% <100.00%> (+0.32%)	:arrow_up:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
server/controllers/utils/parsers.ts	88.46% <100.00%> (ø)
server/controllers/utils/functions.ts	50.00% <0.00%> (ø)
server/services/utils/functions.ts	82.19% <0.00%> (+5.47%)	:arrow_up:

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