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!'
    )
```
tests/providers/telegram/operators/test_telegram.py
def setUp(self):
        db.merge_conn(
            Connection(
                conn_id='telegram_default',
                conn_type='http',
                password=TELEGRAM_TOKEN,
            )
        )
        db.merge_conn(
            Connection(
                conn_id='telegram_default-with-chat-id',
                conn_type='http',
                password=TELEGRAM_TOKEN,
                host="-420913222",
            )
        )
    @mock.patch('airflow.providers.telegram.operators.telegram.TelegramHook')
    def test_should_send_message_when_all_parameters_are_provided(self, mock_telegram_hook):