feat(api): issue #209 - find all by author

[cyp3rius]

Ticket

https://github.com/VirtusLab/strapi-plugin-comments/issues/209

Summary

What does this PR do/solve?

Provides ability to filter by author for generic & strapi users

• /api/comments/author/:id - Strapi users
• /api/comments/author/:id/generic - Generic users

Test Plan

1. Run you projects with some comments created
2. Run queries against endpoints:
   • /api/comments/author/:id - Strapi users
   • /api/comments/author/:id/generic - Generic users
3. You should get comments authored by specific user with related entity attached

[codecov-commenter]

Codecov Report

Merging #213 (e47684a) into master (69293c1) will increase coverage by 0.98%. The diff coverage is 88.33%.

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@@            Coverage Diff             @@
##           master     #213      +/-   ##
==========================================
+ Coverage   79.59%   80.58%   +0.98%     
==========================================
  Files          34       35       +1     
  Lines         897      927      +30     
  Branches      302      315      +13     
==========================================
+ Hits          714      747      +33     
+ Misses        179      176       -3     
  Partials        4        4              

Flag	Coverage Δ
unittest	80.58% <88.33%> (+0.98%)	:arrow_up:

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Impacted Files	Coverage Δ
server/services/utils/parsers.ts	85.36% <85.36%> (ø)
server/services/common.ts	84.11% <94.11%> (+3.89%)	:arrow_up:
server/services/utils/functions.ts	82.27% <100.00%> (ø)
server/utils/constants.ts	100.00% <100.00%> (ø)