fix: fix PagerPan not triggering onIndexChange when animation is disabled (#632)
fix: fix PagerPan not triggering onIndexChange when animation is disabled (#632)

`PagerPan` doesn't trigger `props.onIndexChange` when `animationEnabled={false}`. without `Animated.parallel` and it's finished callback, `PagerPan` doesn't call `props.jumpTo` to make it all right.

### Test plan

Use `PagerPan` and set `animationEnabled={false}`, should trigger `props.onIndexChange` correctly.
react-native-community/react-native-tab-view,react-native-community/react-native-tab-view