SFTP Sensor Async

Checks for the existence of a file on an SFTP server SFTPSensorAsync.

async_sftp_sensor = SFTPSensorAsync(
    task_id="async_sftp_sensor",
    sftp_conn_id=SFTP_CONN_ID,
    path="/home/ubuntu/",
    file_pattern="*.csv",
    poke_interval=5,
)
# https://github.com/astronomer/astronomer-providers/tree/main/astronomer/providers/sftp/example_dags/example_sftp.py