Dispatch http.lifecyle.response from exception handler (#2299)

sanic/app.py

@@ -775,6 +775,14 @@ class Sanic(BaseSanic, metaclass=TouchUpMeta):
             if request.stream:
                 response = request.stream.response
         if isinstance(response, BaseHTTPResponse):
+            await self.dispatch(
+                "http.lifecycle.response",
+                inline=True,
+                context={
+                    "request": request,
+                    "response": response,
+                },
+            )
             await response.send(end_stream=True)
         else:
             raise ServerError(