Criteria preferences in video recommendations

[lfaucon]

Add the slider per criterias in the search filter. Be careful about not triggering too many requests to the server when changing the slider values. Throttling the requests at 1 per second should be good.

An example request could be https://api.staging.tournesol.app/video/?importance=0&reliability=100
(This seems broken on the backend riught now. Seems like a small bug that could be fixed in the context of this ticket)