feat(setScrollPercent): align trackScroll with videoPercentage

[tarsisexistence]

This PR addresses this issue https://github.com/dkaoster/scrolly-video/issues/89.

By design, I add a new callback that replaces setTargetTimePercent because it manipulates with currentTime which doesn't have a sync with a scroll position (described in issue #89).

So, here we

• keep scroll listener of handler updateScrollPercentage that uses setTargetTimePercent under the hood
• keep setTargetTimePercent for non-trackScroll implementation (even though now it's possible to enable both at the same time)
• introduce setPercentage in conjunction with trackScroll, so here we unlock the possibility to use track scroll and programmatic scroll in the same flow.

[tarsisexistence]

@dkaoster, I wonder whether we should adjust anything else here?

And I should probably add the support for callbacks of other implementations (like Svelte)

[tarsisexistence]

@dkaoster I decided to support videoPercentage on instance as well. So if videoPercentage is changed with enabled trackScroll - we prefer setPercentage instead of setTargetTimePercent

I did the same for Svelte and Vue. I need help to validate them. I would appreciate your review.