Register handler for message

        .. code-block:: python3

            # This handler works only if state is None (by default).
            dp.register_message_handler(cmd_start, commands=['start', 'about'])
            dp.register_message_handler(entry_point, commands=['setup'])

            # This handler works only if current state is "first_step"
            dp.register_message_handler(step_handler_1, state="first_step")

            # If you want to handle all states by one handler, use `state="*"`.
            dp.register_message_handler(cancel_handler, commands=['cancel'], state="*")
            dp.register_message_handler(cancel_handler, lambda msg: msg.text.lower() == 'cancel', state="*")

        :param callback:
        :param commands: list of commands
        :param regexp: REGEXP
        :param content_types: List of content types.
        :param custom_filters: list of custom filters
        :param kwargs:
        :param state:
        :return: decorated function

def register_message_handler(self, callback, *custom_filters, commands=None, regexp=None, content_types=None,
                                 state=None, run_task=None, **kwargs):
        """
        Register handler for message

        .. code-block:: python3

            # This handler works only if state is None (by default).
            dp.register_message_handler(cmd_start, commands=['start', 'about'])
            dp.register_message_handler(entry_point, commands=['setup'])

            # This handler works only if current state is "first_step"
            dp.register_message_handler(step_handler_1, state="first_step")

            # If you want to handle all states by one handler, use `state="*"`.
            dp.register_message_handler(cancel_handler, commands=['cancel'], state="*")
            dp.register_message_handler(cancel_handler, lambda msg: msg.text.lower() == 'cancel', state="*")

        :param callback:
        :param commands: list of commands
        :param regexp: REGEXP
        :param content_types: List of content types.
        :param custom_filters: list of custom filters
        :param kwargs:
        :param state:
        :return: decorated function
        """
        filters_set = self.filters_factory.resolve(self.message_handlers,
                                                   *custom_filters,
                                                   commands=commands,
                                                   regexp=regexp,
                                                   content_types=content_types,
                                                   state=state,
                                                   **kwargs)
        self.message_handlers.register(self._wrap_async_task(callback, run_task), filters_set)