feat: add project management API

[FestimReqi]

Summary

• Add project management application use cases
• Add REST endpoints for creating, reading, updating and archiving projects
• Add PostgreSQL repository implementation
• Add validation and ProblemDetails error responses
• Add unit and integration tests
• Update API examples and documentation

Verification

• Release build passed
• 38 tests passed
• 0 tests failed
• No vulnerable packages detected
• git diff --check passed