[Feature Request] Ability to scrub animation

[hybridherbst]

Currently, animation clips can just be played back by activating them.
For longer animations, this is pretty cumbersome; would be great if there was (for each render engine) a slider for
a) seeing current animation time and
b) scrubbing through the clip.

Use case: we have some GLB animations that are more than 3 minutes long and it would be great to be able to watch / validate the animation right in VS Code. Currently we have to go to external tools that have a time scrub ability.