Adds pre and post processing to the websocket dispatching.

        Arguments:
            websocket_context: The websocket context, optional to match
                the Flask convention.

async def full_dispatch_websocket(
        self, websocket_context: Optional[WebsocketContext]=None,
    ) -> Optional[Response]:
        """Adds pre and post processing to the websocket dispatching.

        Arguments:
            websocket_context: The websocket context, optional to match
                the Flask convention.
        """
        await self.try_trigger_before_first_request_functions()
        await websocket_started.send(self)
        try:
            result = await self.preprocess_websocket(websocket_context)
            if result is None:
                result = await self.dispatch_websocket(websocket_context)
        except Exception as error:
            result = await self.handle_user_exception(error)
        return await self.finalize_websocket(result, websocket_context)