feat: prevent events on disabled elements

[mdjastrzebski]

Summary

Prevent calling event handlers for disabled components.

Fixes #28

Test plan

Added tests for TouchableOpacity and Pressable in two configuration: lone element (expected throw no handler found) and nested elements: inner disabled, outer handling event.

[mdjastrzebski]

I've managed to implement this using props.onStartShouldSetResponder(), the same check that React Native uses to verify whether it should start events. The problematic issues has been that, when using React Test Renderer output, event handlers like onPress are usually props of composite components while props.onStartShouldSetResponder() is available on a descedant host component.

This implementation captures the last host component when traversing up the element tree when looking for event handler.

[thymikee]

Please update the migration guide accordingly as well :)

[mdjastrzebski]

Updated docs