Add selectors to Downloader service definitions (#46638)

homeassistant/components/downloader/services.yaml

@@ -1,15 +1,28 @@
 download_file:
-  description: Downloads a file to the download location.
+  description: Downloads a file to the download location
   fields:
     url:
+      name: URL
       description: The URL of the file to download.
+      required: true
       example: "http://example.org/myfile"
+      selector:
+        text:
     subdir:
+      name: Subdirectory
       description: Download into subdirectory.
       example: "download_dir"
+      selector:
+        text:
     filename:
+      name: Filename
       description: Determine the filename.
       example: "my_file_name"
+      selector:
+        text:
     overwrite:
+      name: Overwrite
       description: Whether to overwrite the file or not.
-      example: "false"
+      default: false
+      selector:
+        boolean: