feat: Add support for String Corrections API endpoints

[Bibisha06]

Description

This PR adds support for the new String Corrections API in the Crowdin Ruby client library. The following endpoints have been implemented and tested:

• List Corrections (list_corrections)
• Get Correction (get_correction)
• Add Correction (add_correction)
• Delete Corrections (delete_corrections)
• Delete Correction (delete_correction)
• Restore Correction (restore_correction)

All endpoints include corresponding RSpec tests in spec/api_resources/string_corrections_spec.rb to ensure proper functionality.

Changes Include

• Updated lib/crowdin-api/api_resources/string_corrections.rb with methods for the new endpoints.
• Added tests in spec/api_resources/string_corrections_spec.rb for:
  • Listing corrections
  • Adding a correction
  • Retrieving a correction
  • Deleting corrections
  • Deleting a correction
  • Restoring a correction

Related Issue

This PR closes #107

Testing

• Verified each method with RSpec tests
• All tests pass successfully

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.37%. Comparing base (dbcdbd8) to head (a66252a).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #110      +/-   ##
==========================================
+ Coverage   98.30%   98.37%   +0.08%     
==========================================
  Files          61       63       +2     
  Lines        2984     3119     +135     
==========================================
+ Hits         2933     3068     +135     
  Misses         51       51              

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[andrii-bodnar]

@Bibisha06 thank you for the contribution!