Hi there 👋

I was playing with the **TelegramOperator** and stumbled upon a bug with the `text` field. It is supposed to be a template field but in reality the instance of the **TelegramOperator** does not have this attribute thus every time I try to execute code I get the error:

> AttributeError: 'TelegramOperator' object has no attribute 'text'

```python
TelegramOperator(
        task_id='send_message_telegram',
        telegram_conn_id='telegram_conn_id',
        text='Hello from Airflow!'
    )
```
airflow/providers/telegram/operators/telegram.py
self,
        *,
        telegram_conn_id: str = "telegram_default",
        token: Optional[str] = None,
        chat_id: Optional[str] = None,
        text: str = "No message has been set.",
        telegram_kwargs: Optional[dict] = None,
        **kwargs,
    ):
        self.chat_id = chat_id
        self.token = token
        self.telegram_kwargs = telegram_kwargs or {}
        if text is not None:
            self.telegram_kwargs['text'] = text
        if telegram_conn_id is None:
            raise AirflowException("No valid Telegram connection id supplied.")
        self.telegram_conn_id = telegram_conn_id
        super().__init__(**kwargs)
    def execute(self, **kwargs) -> None:
        """Calls the TelegramHook to post the provided Telegram message"""
        telegram_hook = TelegramHook(
            telegram_conn_id=self.telegram_conn_id,
            token=self.token,
            chat_id=self.chat_id,
        )
        telegram_hook.send_message(self.telegram_kwargs)