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/datasource/__init__.py

@@ -0,0 +1,16 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.