Invidious: Add youtube embedd fallback

[elypter]

while i highly prefer the invidious player but some videos wont play like geoblocked videos, livestreams or 360° videos and sometimes i want to see the annotations. it would be nice to have a fallback embed for those and other unforseen situations.

[Discookie]

Usually you can bypass geo-blocks with DASH videos, since they are proxied through invidious itself - see #34 for info on turning it on.

There are also plans to proxy other formats when not available as well, in #90 and #92.

[dimqua]

There's a livestream and annotations support atm too.

[github-actions[bot]]

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[elypter]

this is more valid than ever unfortunately. i frequently get videos that just wont play on an invidious instance or just general problems with relyability. i often have to click "watch on youtube". i would highly prefer an embedd fallback over this workaround.