Feature/add mis endpoints in query

[bluepal-prasanthi-moparthi]

This includes the following Query-related endpoints:

1. GET - _db/{database-name}/_api/query/properties
2. PUT - _db/{database-name}/_api/query/properties
3. GET - _db/{database-name}/_api/query/current
4. GET - _db/{database-name}/_api/query/slow
5. DELETE - _db/{database-name}/_api/query/slow
6. DELETE - _db/{database-name}/_api/query/{query-id}
7. GET - _db/{database-name}/_api/query/rules
8. GET - _db/{database-name}/_api/query-plan-cache
9. DELETE - _db/{database-name}/_api/query-plan-cache
10. GET - _db/{database-name}/_api/query-cache/entries
11. DELETE - _db/{database-name}/_api/query-cache
12. GET - _db/{database-name}/_api/query-cache/properties
13. PUT - _db/{database-name}/_api/query-cache/properties
14. POST - _db/{database-name}/_api/aqlfunction
15. DELETE - _db/{database-name}/_api/aqlfunction/{name}
16. GET - _db/{database-name}/_api/aqlfunction

[Copilot]

Pull Request Overview

This PR adds comprehensive query-related endpoints to the ArangoDB Go driver v2, implementing 16 missing API endpoints for query management and user-defined functions. The implementation provides full query system control including properties management, query monitoring, caching, optimization rules, and user-defined function operations.

• Adds query properties management endpoints (GET/PUT)
• Implements query monitoring and control endpoints (current/slow queries, kill operations)
• Adds query caching and plan cache management endpoints
• Includes optimizer rules and user-defined function endpoints

Reviewed Changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
v2/utils/type.go	Adds ToJSONString utility function for JSON formatting
v2/tests/database_query_test.go	Comprehensive test suite for all new query endpoints
v2/arangodb/utils.go	Adds RequiredFieldError helper function
v2/arangodb/database_query_impl.go	Complete implementation of all 16 query endpoints
v2/arangodb/database_query.go	Interface definitions and data structures for query endpoints
v2/CHANGELOG.md	Documents the addition of missing query endpoints

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