Opt-out for onScroll

[usrbowe]

Add opt-out mechanism to not rely on onScroll prop, if we want to use react-native-reanimated with onScroll to be assigned to event. I added internal method to update offset, which we can pass via ref.

Example of reanimated callback:

block([
    cond(
      greaterThan(diff(this._transY), 1),
      call([this._transY], ([y]) => this._viewportRef?.setOffset({ y }))
    ),
    this._transY,
  ]);

[coveralls]

Pull Request Test Coverage Report for Build 460

• 0 of 3 (0.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.3%) to 81.045%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
packages/components/src/viewport/tracker/index.js	0	3	0.0%
<!--	Total:	0	3	0.0%	-->

Totals
Change from base Build 459:	-0.3%
Covered Lines:	1207
Relevant Lines:	1423

---

💛 - Coveralls

[ognen]

Hi, this pull request is rather unclean and I cannot accept it.