Improve/paginated scrolling on ios

[zenangst]

This improves paginated scrolling on iOS by manually implementing how the component should scroll instead of relying on isPagingEnabled which does not take content insets, section insets, and item spacing into account.

[zenangst]

I might need to revisit this to make it work with different spans I think, but it became kinda big.

[codecov[bot]]

Codecov Report

Merging #809 into master will decrease coverage by 1.08%. The diff coverage is 46.87%.

@@            Coverage Diff             @@
##           master     #809      +/-   ##
==========================================
- Coverage   85.18%   84.09%   -1.09%     
==========================================
  Files         152      152              
  Lines       10488    10520      +32     
==========================================
- Hits         8934     8847      -87     
- Misses       1554     1673     +119

Flag	Coverage Δ
#ios	82.91% <46.87%> (-0.28%)	:arrow_down:
#osx	86.62% <ø> (ø)	:arrow_up:
#tvos	82.07% <46.87%> (+7.69%)	:arrow_up:

Impacted Files	Coverage Δ
...ources/iOS/Extensions/Component+iOS+Carousel.swift	90.9% <ø> (-0.59%)	:arrow_down:
Sources/iOS/Classes/ComponentFlowLayout.swift	67.65% <0%> (-7.44%)	:arrow_down:
...ces/iOS/Extensions/Delegate+iOS+UIScrollView.swift	49% <86.66%> (+0.68%)	:arrow_up:
Sources/iOS/Classes/Component.swift	90.87% <89.47%> (+0.1%)	:arrow_up:
SpotsTests/tvOS/SpotsControllerTVOSTests.swift	0% <0%> (-100%)	:arrow_down:
SpotsTests/tvOS/SpotsScrollViewTVOSTests.swift	0% <0%> (-100%)	:arrow_down:
...potsTests/Shared/ComponentFocusDelegateTests.swift	0% <0%> (-86.37%)	:arrow_down:
...es/iOS-Exclusive/Classes/SpotsScrollView+iOS.swift	88.67% <0%> (-11.33%)	:arrow_down:
SpotsTests/iOS/ComponentDelegateiOSTests.swift	81.01% <0%> (-3.8%)	:arrow_down:
...urces/iOS/Extensions/Delegate+iOS+Extensions.swift	88.88% <0%> (-1.24%)	:arrow_down:

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[onmyway133]

As @vadymmarkov said 😬 I think it will be better if we add test right when we add/change the code instead of adding later ❤️

[zenangst]

@onmyway133 yeap tests should be added, however, I'm trying to cover the different scenarios that we have now. The current project has multiple variants which is kinda hard to cover in one go.