Build cleanup

[DylanWelzel]

This pull request introduces a new manager for cleaning up MongoDB build records and their associated collections, adds asynchronous MongoDB support, and exposes new commands and API endpoints for build management. The changes enhance the hub's ability to list, delete, and validate build records, keeping the database in sync with actual data and improving maintainability.

MongoDB Build Cleanup Features:

• Added MongoBuildCleanupManager and MongoBuildCleaner classes in biothings/hub/dataindex/mongo_build_cleanup.py to support listing, deleting, and validating MongoDB build records and their target collections asynchronously.
• Integrated the new manager into the hub initialization (biothings/hub/__init__.py), registering it and exposing its methods as commands (list_mongo_builds, delete_mongo_builds, validate_mongo_builds). [1] [2] [3]

API and Command Exposure:

• Added new API endpoints for MongoDB build management (mongo_builds, mongo_builds/delete, mongo_builds/validate) in biothings/hub/__init__.py.

Async MongoDB Support:

• Introduced AsyncMongoClient and related async helper functions in biothings/utils/mongo.py to enable asynchronous database operations, used by the new cleanup manager. [1] [2] [3] [4]

Dependency Update:

• Updated pyproject.toml to require pymongo>=4.13.0 for stable AsyncMongoClient support. [1] [2]

Logging Consistency:

• Minor adjustments to logging imports in biothings/hub/dataindex/snapshooter.py for consistency. [1] [2]