feat(SPV-1471): add configs shared v2 endpoint

[pawellewandowski98]

Description

• Added new v2 endpoint - /api/v2/configs/shared

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 @dorzepowski resulted in success.

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 52.72%. Comparing base (23c44fa) to head (be884cd).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #897      +/-   ##
==========================================
+ Coverage   52.68%   52.72%   +0.03%     
==========================================
  Files         403      406       +3     
  Lines       17966    17993      +27     
==========================================
+ Hits         9466     9487      +21     
- Misses       7749     7753       +4     
- Partials      751      753       +2     

Flag	Coverage Δ
unittests	52.72% <100.00%> (+0.03%)	⬆️

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

Files with missing lines	Coverage Δ
actions/sharedconfig/get.go	100.00% <100.00%> (ø)
actions/v2/admin/server.go	100.00% <100.00%> (ø)
actions/v2/admin/status.go	100.00% <100.00%> (ø)
actions/v2/base/server.go	100.00% <100.00%> (ø)
actions/v2/base/shared_config.go	100.00% <100.00%> (ø)
actions/v2/server.go	100.00% <100.00%> (ø)
api/gen.api.go	83.33% <100.00%> (+7.33%)	⬆️
api/gen.models.go	0.00% <ø> (ø)
server/server.go	12.19% <100.00%> (ø)

... and 1 file with indirect coverage changes

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