feat: Add validate_sql_json endpoint for checking that a given sql query is valid for the chosen database (#7422) (#7462)

merge from lyft-release-sp8 to master

superset/sql_validators/__init__.py

@@ -0,0 +1,27 @@
+# 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.
+from typing import Optional
+
+from . import base  # noqa
+from . import presto_db  # noqa
+from .base import SQLValidationAnnotation  # noqa
+
+
+def get_validator_by_name(name: str) -> Optional[base.BaseSQLValidator]:
+    return {
+        'PrestoDBSQLValidator': presto_db.PrestoDBSQLValidator,
+    }.get(name)