chore: switching out ConnectorRegistry references for DatasourceDAO (#20380)

* rename and move dao file

* Update dao.py

* add cachekey

* Update __init__.py

* change reference in query context test

* add utils ref

* more ref changes

* add helpers

* add todo in dashboard.py

* add cachekey

* circular import error in dar.py

* push rest of refs

* fix linting

* fix more linting

* update enum

* remove references for connector registry

* big reafctor

* take value

* fix

* test to see if removing value works

* delete connectregistry

* address concerns

* address comments

* fix merge conflicts

* address concern II

* address concern II

* fix test

Co-authored-by: Phillip Kelley-Dotson <pkelleydotson@yahoo.com>

superset/models/slice.py

@@ -39,7 +39,7 @@ from sqlalchemy.engine.base import Connection
 from sqlalchemy.orm import relationship
 from sqlalchemy.orm.mapper import Mapper
 
-from superset import ConnectorRegistry, db, is_feature_enabled, security_manager
+from superset import db, is_feature_enabled, security_manager
 from superset.legacy import update_time_range
 from superset.models.helpers import AuditMixinNullable, ImportExportMixin
 from superset.models.tags import ChartUpdater
@@ -126,7 +126,10 @@ class Slice(  # pylint: disable=too-many-public-methods
 
     @property
     def cls_model(self) -> Type["BaseDatasource"]:
-        return ConnectorRegistry.sources[self.datasource_type]
+        # pylint: disable=import-outside-toplevel
+        from superset.datasource.dao import DatasourceDAO
+
+        return DatasourceDAO.sources[self.datasource_type]
 
     @property
     def datasource(self) -> Optional["BaseDatasource"]: