Add example dag for SFTP and Local (#1866)

# Description
## What is the current behavior?
Missing example dag for SFTP and Local data provides.



## What is the new behavior?
Added example dag for SFTP and Local data provides

## Does this introduce a breaking change?
Nope


### Checklist
- [ ] Created tests which fail without the change (if possible)
- [ ] Extended the README / documentation, if necessary

---------

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

example_dags/example_universal_transfer_operator.py

@@ -1,4 +1,5 @@
 import os
+import pathlib
 from datetime import datetime
 
 from airflow import DAG
@@ -11,6 +12,9 @@
 s3_bucket = os.getenv("S3_BUCKET", "s3://astro-sdk-test")
 gcs_bucket = os.getenv("GCS_BUCKET", "gs://uto-test")
 
+CWD = pathlib.Path(__file__).parent
+DATA_DIR = str(CWD) + "/../../data/"
+
 # [START dataset_file]
 input_file = File(path=f"{gcs_bucket}/uto/", conn_id="google_cloud_default")
 # [END dataset_file]
@@ -134,3 +138,9 @@
         destination_dataset=Table(name="uto_bigquery_to_sqlite_table", conn_id="sqlite_default"),
     )
     # [END transfer_non_native_bigquery_to_sqlite]
+
+    transfer_non_native_local_to_sftp = UniversalTransferOperator(
+        task_id="transfer_non_native_local_to_sftp",
+        source_dataset=File(path=f"{DATA_DIR}sample.csv", filetype=FileType.CSV),
+        destination_dataset=File(path="sftp://upload/sample.csv", conn_id="sftp_conn", filetype=FileType.CSV),
+    )