[extractor] Add dev option --load-pages

yt_dlp/__init__.py

@@ -758,6 +758,7 @@ def parse_options(argv=None):
         'verbose': opts.verbose,
         'dump_intermediate_pages': opts.dump_intermediate_pages,
         'write_pages': opts.write_pages,
+        'load_pages': opts.load_pages,
         'test': opts.test,
         'keepvideo': opts.keepvideo,
         'min_filesize': opts.min_filesize,