Enable nested scrolling of horizontal scrollviews on Android

[isnotgood]

Summary

On iOS nested scrolling in horizontal ScrollViews work out of box, on Android it's actually limited by Android's HorizontalScrollView implementation. By slight adjustment in ReactHorizontalScrollView we can have feature parity on Android as well.

Changelog

[Android] [Changed] - Enabled scrolling in nested horizontal ScrollViews

Test Plan

Before	After
Only the top ScrollView is consuming the gesture so nested one doesn't have a chance	After the fix the bottom one is targeted by gesture and nested scrolling works

Steps to test

1. Create fresh react native app with react native compiled from this branch
2. Replace App.js with this gist
3. Run android app and observe the nested horizontal scrollviews behaves as expected

I would love to write integration and probably some performance test but I'm having problem running them from Android Studio. Only thing I'm able to achieve is to run all test with buck. I would be grateful for any guidance. Also I understand that that lookup code could be performance bottleneck in some extreme cases and I'm willing to optimize it further if it will be considered worthy😄

[analysis-bot]

RNTester.app (iOS): 10657792 bytes

[analysis-bot]

RNTester (Android/hermes/arm64-v8a): 3289088 bytes
RNTester (Android/hermes/armeabi-v7a): 3129344 bytes
RNTester (Android/hermes/x86): 3461120 bytes
RNTester (Android/hermes/x86_64): 3424256 bytes
RNTester (Android/jsc/arm64-v8a): 4446208 bytes
RNTester (Android/jsc/armeabi-v7a): 4268032 bytes
RNTester (Android/jsc/x86): 4358144 bytes
RNTester (Android/jsc/x86_64): 4644864 bytes

[GuoMeng6]

I tried, but it is not useful

[isnotgood]

@GuoMeng6 what do you mean?