Expose get_file_list_func to users (#1380)

This exposes `get_file_list_func` to users so that they can use it in
`@task` or `@task.virtualenv`

Context:
https://astronomer.slack.com/archives/C02B8SPT93K/p1670408501306539?thread_ts=1669893212.365849&cid=C02B8SPT93K

python-sdk/src/astro/files/__init__.py

@@ -2,8 +2,8 @@
 
 from airflow.hooks.base import BaseHook
 
-from astro.files.base import File  # noqa: F401 # skipcq: PY-W2000
-from astro.files.base import resolve_file_path_pattern  # noqa: F401 # skipcq: PY-W2000
+from astro.files.base import File, resolve_file_path_pattern  # noqa: F401 # skipcq: PY-W2000
+from astro.files.operators.files import get_file_list_func  # noqa: F401 # skipcq: PY-W2000
 
 if TYPE_CHECKING:
     from airflow.models.xcom_arg import XComArg

python-sdk/src/astro/files/operators/files.py

@@ -1,3 +1,5 @@
+from __future__ import annotations
+
 from typing import Any
 
 from airflow.decorators.base import get_unique_task_id
@@ -29,8 +31,13 @@ def __init__(self, path: str, conn_id: str, task_id: str = "", **kwargs):
         super().__init__(task_id=task_id, **kwargs)
 
     def execute(self, context: Context) -> Any:  # skipcq: PYL-W0613
-        location = create_file_location(self.path, self.conn_id)
+        files = get_file_list_func(self.path, self.conn_id)
         # Get list of files excluding folders
-        return [
-            File(path=path, conn_id=location.conn_id) for path in location.paths if not path.endswith("/")
-        ]
+        return [File(path=file, conn_id=self.conn_id) for file in files]
+
+
+def get_file_list_func(path: str, conn_id: str) -> list[str]:
+    """Function to get list of files from a bucket"""
+    location = create_file_location(path, conn_id)
+    # Get list of files excluding folders
+    return [path for path in location.paths if not path.endswith("/")]