Add transaction suggestion feature

[gjong]

Breaking change

Proposed change

Introduced TransactionSuggestionResource and related request model to provide transaction change suggestions based on predefined rules. Added comprehensive testing to ensure accurate suggestions and correct integration with the application.

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New feature (which adds functionality to the application)
• Deprecation (breaking change to happen in the future)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Additional information

Checklist

• The code change is tested and works locally.
• Local tests pass. Your PR cannot be merged unless tests pass
• There is no commented out code in this PR.
• Tests have been added to verify that the new code works.

[sonarcloud]

Quality Gate passed

Issues
1 New issue
0 Accepted issues

Measures
0 Security Hotspots
74.1% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud