add option to use different youtube-dl modules (fixes #1330)

by setting the 'downloader.ytdl.module' value. For example

{
    "downloader": {
        "ytdl": {
            "module": "yt_dlp"
        }
    }
}

or '-o module=yt_dlp'

scripts/hook-gallery_dl.py

@@ -7,3 +7,5 @@ hiddenimports = [
     for package in (extractor, downloader, postprocessor)
     for module in package.modules
 ]
+
+hiddenimports.append("youtube_dl")