feat(YouTube/Seekbar components): add Enable Cairo seekbar settings

[inotia00]

Application

YouTube

Feature description

This is not a patch request, but a description of the feature that will be introduce in the next release.

Cairo layout is a new layout that Google is preparing.
Cairo layout will be applied to settings, icons, fonts, and splash animations over time.

Cairo seekbar is also one of the Cairo layouts.

The Cairo seekbar setting will be set to Experimental Flags for the following reasons:

1. Since this is the most recently added experimental flag, changes on the server side may break the patch at any time.
2. For similar reasons, the possibility of bugs occurring is very high.

Motivation

Google has started aggressively adding experimental flags in recent months.

Experimental flags interfere with patch implementation, so continuous tracking of experimental flags is necessary.

Acknowledgements

• This is not a feature request for YouTube.
• This issue is not a duplicate of an existing feature request.
• I have chosen an appropriate title.
• All requested information has been provided properly.
• I have written the title and contents in English.

[inotia00]

reflected in revanced-patches-4.9.2