React events: consolidate logic of Hover event component

[necolas]

Stacks on #15449. Demo integrating this patch: https://fburl.com/nfye4390

Minor refactor of Hover and additional regression coverage.

Ref #15257

[trueadm]

The CI seems to be failing here.

[necolas]

It should start passing once I merge the commit it depends on

[sizebot]

Details of bundled changes.

Comparing: 5857c89...fd689e6

react-events

File	Filesize Diff	Gzip Diff	Prev Size	Current Size	Prev Gzip	Current Gzip	ENV
react-events.development.js	0.0%	-0.3%	1.59 KB	1.59 KB	687 B	685 B	UMD_DEV
react-events.production.min.js	0.0%	-0.4%	857 B	857 B	477 B	475 B	UMD_PROD
react-events.development.js	0.0%	-0.2%	1.4 KB	1.4 KB	624 B	623 B	NODE_DEV
react-events.production.min.js	0.0%	-0.3%	698 B	698 B	400 B	399 B	NODE_PROD
react-events-press.development.js	0.0%	-0.0%	20.45 KB	20.45 KB	4.77 KB	4.77 KB	UMD_DEV
react-events-press.production.min.js	0.0%	-0.0%	7.75 KB	7.75 KB	2.64 KB	2.64 KB	UMD_PROD
react-events-press.development.js	0.0%	-0.0%	20.28 KB	20.28 KB	4.73 KB	4.73 KB	NODE_DEV
react-events-press.production.min.js	0.0%	-0.0%	7.58 KB	7.58 KB	2.59 KB	2.59 KB	NODE_PROD
react-events-hover.development.js	+13.3%	+12.9%	8.29 KB	9.39 KB	2.07 KB	2.34 KB	UMD_DEV
react-events-hover.production.min.js	🔺+7.1%	🔺+9.9%	3.54 KB	3.79 KB	1.3 KB	1.42 KB	UMD_PROD
react-events-hover.development.js	+13.5%	+12.9%	8.12 KB	9.22 KB	2.03 KB	2.3 KB	NODE_DEV
react-events-hover.production.min.js	🔺+7.6%	🔺+10.9%	3.38 KB	3.63 KB	1.25 KB	1.38 KB	NODE_PROD
ReactEventsHover-dev.js	+12.0%	+12.7%	8.23 KB	9.21 KB	2.04 KB	2.3 KB	FB_WWW_DEV
ReactEventsHover-prod.js	🔺+7.4%	🔺+10.4%	6.88 KB	7.39 KB	1.61 KB	1.78 KB	FB_WWW_PROD
react-events-focus.development.js	0.0%	-0.1%	4.06 KB	4.06 KB	1.33 KB	1.33 KB	UMD_DEV
react-events-focus.production.min.js	0.0%	-0.1%	1.65 KB	1.65 KB	788 B	787 B	UMD_PROD
react-events-focus.development.js	0.0%	-0.1%	3.89 KB	3.89 KB	1.29 KB	1.29 KB	NODE_DEV
react-events-focus.production.min.js	0.0%	-0.3%	1.49 KB	1.49 KB	724 B	722 B	NODE_PROD
react-events-swipe.development.js	0.0%	-0.0%	8.43 KB	8.43 KB	2.63 KB	2.62 KB	UMD_DEV
react-events-swipe.production.min.js	0.0%	-0.1%	3.46 KB	3.46 KB	1.61 KB	1.61 KB	UMD_PROD
react-events-swipe.development.js	0.0%	-0.0%	8.26 KB	8.26 KB	2.59 KB	2.59 KB	NODE_DEV
react-events-swipe.production.min.js	0.0%	-0.1%	3.3 KB	3.3 KB	1.55 KB	1.55 KB	NODE_PROD
react-events-drag.development.js	0.0%	-0.0%	7.96 KB	7.96 KB	2.51 KB	2.51 KB	UMD_DEV
react-events-drag.development.js	0.0%	-0.0%	7.79 KB	7.79 KB	2.47 KB	2.47 KB	NODE_DEV
react-events-drag.production.min.js	0.0%	-0.1%	3.17 KB	3.17 KB	1.45 KB	1.45 KB	NODE_PROD

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