chore: Extensions architecture POC (#31934)

Co-authored-by: Ville Brofeldt <ville.brofeldt@apple.com>
Co-authored-by: Ville Brofeldt <ville@Villes-MacBook-Pro-2024.local>
Co-authored-by: Ville Brofeldt <v_brofeldt@apple.com>

superset/extensions/types.py

@@ -0,0 +1,36 @@
+# 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 dataclasses import dataclass
+
+from superset_core.extensions.types import Manifest
+
+
+@dataclass
+class BundleFile:
+    name: str
+    content: bytes
+
+
+@dataclass
+class LoadedExtension:
+    id: str
+    name: str
+    manifest: Manifest
+    frontend: dict[str, bytes]
+    backend: dict[str, bytes]
+    version: str