feat(YouTube): Add blank thumbnails option / Hide thumbnails

[VBLibre]

Feature description

In the alternative thumbnails patch, add an option for blank thumbnails.

Motivation

This is better than using the "thumbnail" custom filter as it allows for per feed blocking and preserves timestamps and watch bar.

Completely blocking feeds such as related videos and the home page is seemingly impossible but this seems to be the best alternative solution for helping to prevent addiction.

I'm supposed to give evidence that this is something people would care about so here i guess:
#2490
#1083
#981
#2945

Example mockup:

Acknowledgements

• I have checked all open and closed feature requests and this is not a duplicate
• I have chosen an appropriate title.
• All requested information has been provided properly.

[LisoUseInAIKyrios]

A less niche solution is to add a 'Hide thumbnails' setting that selectively hides the thumbnails in the home/subscriptions/player.

[MarcaDian]

related video can hide like this

https://github.com/inotia00/revanced-patches/blob/42cc8201f5dfcc05f785e578475c4e7e52c3ecfd/patches/src/main/kotlin/app/revanced/patches/youtube/feed/components/FeedComponentsPatch.kt#L174-L192

https://github.com/inotia00/revanced-patches/blob/revanced-extended/extensions/shared/src/main/java/app/revanced/extension/youtube/patches/feed/RelatedVideoPatch.java

[LisoUseInAIKyrios]

That only selectively hides videos in the video player (not the home feed), but the home feed can already be hidden by hiding the home nav button and changing the start page.

The approach of selectively hiding under the video player works, but it is slightly fragile since offsets can and have changed.

[VBLibre]

hiding the home page by removing the nav button and changing the start page is also a pretty bad solution, it's still totally possible to get to the home page using the back button (or at least it is on Android 11). There are really 3 areas that need to be able to be blocked, the home feed, the related video feed beneath the comments, and the related video feed under quick actions in fullscreen. That last one should I think be blockable using "hide related videos in quick actions" but as far as I can tell that setting doesn't work anymore.

[MarcaDian]

it's still totally possible to get to the home page using the back button

#4832