feat: instant-set for zero duration

[tivac]

Fixes #4399

This is something I recently needed again, I wanted to immediately set the store to a new value from the authoritative source and then start a tween based on the given rate of change of the value towards the min/max (depending on direction of change). I was getting weird numbers using the { duration : 1 } hack until I made the tweened .set() call live in a rAF which just seemed silly.

Now, if you call .set(<value>, { duration : 0 }) it'll just set immediately and as a bonus do way less work! Added a test that fails w/o this PR (though it fails due to node not having requestAnimationFrame, not due to the value not setting instantly).

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Tests

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