Bux-398/ get waiting contacts

[Nazarii-4chain]

Added GetContacts action,
removed unused files,
change to ShouldBindJson method in contact creation,
Optimized newContact arguments,
adjusted ContactService interface,
changed id generation in contact model,
added tests,
added getContacts handler

Pull Request Checklist

• 📖 I created my PR using provided : CODE_STANDARDS
• 📖 I have read the short Code of Conduct: CODE_OF_CONDUCT
• 🏠 I tested my changes locally.
• ✅ I have provided tests for my changes.
• 📝 I have used conventional commits.
• 📗 I have updated any related documentation.
• 💾 PR was issued based on the Github or Jira issue.

[github-actions]

Manual Tests

💚 Manual testing by @arkadiuszos4chain resulted in success.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 24.13793% with 44 lines in your changes are missing coverage. Please review.

Project coverage is 52.78%. Comparing base (e88eba0) to head (314b572).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #490      +/-   ##
==========================================
- Coverage   52.97%   52.78%   -0.20%     
==========================================
  Files         164      165       +1     
  Lines        9027     9071      +44     
==========================================
+ Hits         4782     4788       +6     
- Misses       3793     3829      +36     
- Partials      452      454       +2     

Flag	Coverage Δ
unittests	52.78% <24.13%> (-0.20%)	⬇️

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

Files	Coverage Δ
actions/contacts/routes.go	100.00% <100.00%> (ø)
engine/model_contact.go	47.72% <75.00%> (+0.22%)	⬆️
actions/contacts/create.go	0.00% <0.00%> (ø)
engine/action_contact.go	0.00% <0.00%> (ø)
actions/contacts/search.go	0.00% <0.00%> (ø)

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