feat: add profiling to Superset pages (#16136)

* feat: add profiling to Superset pages

* Address comments

superset/utils/profiler.py

@@ -0,0 +1,52 @@
+# 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 Any, Callable
+from unittest import mock
+
+from pyinstrument import Profiler
+from werkzeug.wrappers import Request, Response
+
+
+class SupersetProfiler:
+    """
+    WSGI middleware to instrument Superset.
+
+    To see the instrumentation for a given page, set `PROFILING=True`
+    in the config, and append `?_instrument=1` to the page.
+    """
+
+    def __init__(
+        self, app: Callable[[Any, Any], Any], interval: float = 0.0001,
+    ):
+        self.app = app
+        self.interval = interval
+
+    @Request.application
+    def __call__(self, request: Request) -> Response:
+        if request.args.get("_instrument") != "1":
+            return Response.from_app(self.app, request.environ)
+
+        profiler = Profiler(interval=self.interval)
+
+        # call original request
+        fake_start_response = mock.MagicMock()
+        with profiler:
+            self.app(request.environ, fake_start_response)
+
+        # return HTML profiling information
+        return Response(profiler.output_html(), mimetype="text/html")