Add download_file function to sessions_python_plugin

Author: Rmaram07

python/semantic_kernel/core_plugins/sessions_python_tool/sessions_python_plugin.py

@@ -301,6 +301,7 @@ async def list_files(self) -> list[SessionsRemoteFileMetadata]:
                 f"List files failed with status code {e.response.status_code} and error: {error_message}"
             ) from e
 
+    @kernel_function(name="download_file", description="Downloads a file from the current Session ID")
     async def download_file(
         self,
         *,