refactor: Moves the Explore form_data endpoint (#18151)

* refactor: Moves the Explore form_data endpoint

* Removes unused imports

* Fixes openapi schema error

* Fixes typo

* Renames and UPDATING.md

superset/explore/form_data/commands/state.py

@@ -0,0 +1,26 @@
+# 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 typing_extensions import TypedDict
+
+
+class TemporaryExploreState(TypedDict):
+    owner: int
+    dataset_id: int
+    chart_id: Optional[int]
+    form_data: str