Add the option to chose from Youtube's pre-generated thumbnails

[Spaghetto392]

Is your feature request related to a problem? Please describe.
Many Youtube channels use obnoxious, over saturated Thumbnails that are not representative of the actual video. This is often distracting and annoying when trying to look through recommended videos on Youtube.

Describe the solution you'd like
Youtube automatically generates three thumbnails for each video uploaded, the user should be able to request Materialious to serve one of these three thumbnails instead.

Describe alternatives you've considered
DeArrow technically serves as a semi-solution to this, however, their random thumbnails, at least in testing, often seem to be worse.

[Spaghetto392]

Something this could also maybe be used for is as an alternative to DeArrow's random thumbnail function. May potentially help with the amount of requests made to DeArrow.