React Events: consolidate logic for Press event component

[necolas]

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

Refactor of Press and additional regression coverage.

1. The logic for "start", "move", "end", and "cancel" events is consolidated into a single block to reduce duplication and improve consistency of the UX across input-types. Also reduces code size.

2. The bailout logic for anchor tags is removed since we preventDefault for click by default. We can discuss scenarios where it makes sense to limit functionality around interactions on anchor tags.

3. The logic for ignoring emulated events is simplified and improved. Pointer events can produce emulated touch (immediately after pointer) and mouse events (delayed) which is now accounted for and tested.

Ref #15257

[trueadm]

Nice savings in code size. Also CI is failing too for some reason.

[necolas]

Added a link to an interactive demo running this patch. Will start doing this for most PRs that can benefit from reviewers checking interactions for themselves.

[sizebot]

Details of bundled changes.

Comparing: 5857c89...a6c3bc7

react-events

File	Filesize Diff	Gzip Diff	Prev Size	Current Size	Prev Gzip	Current Gzip	ENV
react-events.production.min.js	0.0%	-0.2%	857 B	857 B	477 B	476 B	UMD_PROD
react-events.development.js	0.0%	+0.2%	1.4 KB	1.4 KB	624 B	625 B	NODE_DEV
react-events-press.development.js	-13.7%	-6.3%	20.45 KB	17.64 KB	4.77 KB	4.47 KB	UMD_DEV
react-events-press.production.min.js	-12.5%	-4.0%	7.75 KB	6.78 KB	2.64 KB	2.54 KB	UMD_PROD
react-events-press.development.js	-13.8%	-6.5%	20.28 KB	17.47 KB	4.73 KB	4.43 KB	NODE_DEV
react-events-press.production.min.js	-12.8%	-4.1%	7.58 KB	6.61 KB	2.59 KB	2.49 KB	NODE_PROD
ReactEventsPress-dev.js	-16.0%	-8.4%	18.51 KB	15.54 KB	4.03 KB	3.69 KB	FB_WWW_DEV
ReactEventsPress-prod.js	-17.5%	-6.5%	15.55 KB	12.84 KB	3.01 KB	2.82 KB	FB_WWW_PROD
react-events-hover.development.js	0.0%	-0.0%	8.29 KB	8.29 KB	2.07 KB	2.07 KB	UMD_DEV
react-events-hover.production.min.js	0.0%	-0.1%	3.54 KB	3.54 KB	1.3 KB	1.29 KB	UMD_PROD
react-events-hover.development.js	0.0%	-0.0%	8.12 KB	8.12 KB	2.03 KB	2.03 KB	NODE_DEV
react-events-hover.production.min.js	0.0%	-0.1%	3.38 KB	3.38 KB	1.25 KB	1.24 KB	NODE_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

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