direct db access

[akindu-k]

Description

This pull request introduces a new direct database access layer for MongoDB in the jac-scale project. It adds a Db class with standard CRUD operations, a get_db() helper, and comprehensive tests to ensure correct functionality. This enhancement allows users and internal code to interact with MongoDB directly, improving flexibility and developer experience.

Direct Database Access Layer:

• Introduced Db class in jac_scale/db.jac that provides methods for find_one, find, insert_one, update_one, delete_one, and commit operations on MongoDB collections. Also added a get_db() function for obtaining a Db instance.
• Implemented the logic for all Db methods in jac_scale/impl/db.impl.jac, including handling MongoDB connections and CRUD operations. The commit method is a no-op, reflecting MongoDB's behavior.

Testing and Documentation:

• Added jac_scale/tests/test_db_direct.py to provide comprehensive tests for the new direct database access functionality, including setup/teardown of a MongoDB container and validation of all CRUD operations.
• Updated the release notes in docs/docs/community/release_notes/jac-scale.md to document the introduction of direct database access and the new Db class.

Closes #4355