Move hitSlop normalization to JS (#4388)

## Description

This moves the parsing and validation of `hitSlop` into one shared JS
module and reduces the platforms to reading a fixed shape.

JS now sends a normalized [left, top, right, bottom, width, height]
array, where null marks an unspecified edge. That layout matches what
the platforms already stored internally (FloatArray(6) on Android,
RNGHHitSlop on Apple), so the native parsers shrink to mapping null →
NaN, plus the DIP→px conversion on Android.

Applied at all four producers: filterConfig (v1 and v2),
prepareConfigForNativeSide (v3), bindSharedValues (v3's UI-thread path)
and the button's web wrapper.



## Test plan

Tested on Android, iOS and Web