feat(SPV-846): refactor numeric error codes into strings

[pawellewandowski98]

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.

Description

• Refactored way how the errors are return. Now every error which is return from our endpoint is located in spverror package. It is required to define it in two places:

1. definitions.go - define error which will be used in code
2. errors.go - it has map which has error as a key and value contain message, status code and code error which will be returned

Example:
request does not have auth header

• Set error response by method from spverrors package
  

• Error defined in ./spverrors/errors.go
  

• Response with status 401:
  

If error is not defined in map we return default error:

[github-actions]

Manual Tests

💚 Manual testing by @chris-4chain resulted in success.

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 17.66382% with 289 lines in your changes missing coverage. Please review.

Project coverage is 48.89%. Comparing base (dc45064) to head (785af1c).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #627      +/-   ##
==========================================
+ Coverage   48.83%   48.89%   +0.05%     
==========================================
  Files         257      259       +2     
  Lines       11524    11531       +7     
==========================================
+ Hits         5628     5638      +10     
+ Misses       5312     5309       -3     
  Partials      584      584              

Flag	Coverage Δ
unittests	48.89% <17.66%> (+0.05%)	⬆️

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

Files	Coverage Δ
engine/client_internal.go	94.31% <ø> (ø)
engine/pike/pike.go	70.00% <ø> (ø)
models/filter/utils.go	87.09% <100.00%> (ø)
actions/admin/stats.go	0.00% <0.00%> (ø)
actions/contacts/accept.go	0.00% <0.00%> (ø)
actions/contacts/confirm.go	0.00% <0.00%> (ø)
actions/contacts/models.go	0.00% <0.00%> (ø)
actions/contacts/reject.go	0.00% <0.00%> (ø)
actions/contacts/unconfirm.go	0.00% <0.00%> (ø)
actions/xpubs/get.go	0.00% <0.00%> (ø)
... and 66 more

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[ac4ch]

except that one file all seems to be good i would say