Add React.unstable_createEventComponent

[necolas]

Introduces a new unstable API for creating event components from event responders.

Ref #15257

[trueadm]

Awesome stuff :)

[sizebot]

React: size: 🔺+0.3%, gzip: 🔺+0.3%

Details of bundled changes.

Comparing: 2e5d1a8...d52b802

react

File	Filesize Diff	Gzip Diff	Prev Size	Current Size	Prev Gzip	Current Gzip	ENV
react.development.js	+0.4%	+0.7%	107.47 KB	107.92 KB	27.21 KB	27.39 KB	UMD_DEV
react.production.min.js	🔺+0.3%	🔺+0.3%	12.28 KB	12.33 KB	4.78 KB	4.8 KB	UMD_PROD
react.profiling.min.js	+0.3%	+0.3%	14.44 KB	14.48 KB	5.3 KB	5.32 KB	UMD_PROFILING
react.development.js	+0.6%	+0.5%	69.65 KB	70.09 KB	17.95 KB	18.04 KB	NODE_DEV
react.production.min.js	🔺+0.7%	🔺+0.5%	6.44 KB	6.48 KB	2.67 KB	2.69 KB	NODE_PROD
React-dev.js	+0.6%	+0.5%	67.92 KB	68.36 KB	17.29 KB	17.38 KB	FB_WWW_DEV
React-prod.js	🔺+1.9%	🔺+1.7%	16.02 KB	16.32 KB	4.24 KB	4.31 KB	FB_WWW_PROD
React-profiling.js	+1.9%	+1.7%	16.02 KB	16.32 KB	4.24 KB	4.31 KB	FB_WWW_PROFILING

react-events

File	Filesize Diff	Gzip Diff	Prev Size	Current Size	Prev Gzip	Current Gzip	ENV
react-events.development.js	0.0%	+0.2%	1.16 KB	1.16 KB	617 B	618 B	UMD_DEV
react-events.production.min.js	0.0%	🔺+0.5%	682 B	682 B	430 B	432 B	UMD_PROD
react-events.development.js	0.0%	+0.2%	996 B	996 B	555 B	556 B	NODE_DEV
react-events.production.min.js	0.0%	🔺+0.6%	512 B	512 B	353 B	355 B	NODE_PROD
react-events-press.development.js	-10.7%	-16.5%	21.25 KB	18.97 KB	5.17 KB	4.32 KB	UMD_DEV
react-events-press.production.min.js	-10.8%	-13.2%	8.09 KB	7.21 KB	2.9 KB	2.51 KB	UMD_PROD
react-events-press.development.js	-1.6%	-2.9%	21.08 KB	20.73 KB	5.13 KB	4.98 KB	NODE_DEV
react-events-press.production.min.js	-0.9%	-1.3%	7.92 KB	7.85 KB	2.84 KB	2.81 KB	NODE_PROD
ReactEventsPress-dev.js	-1.7%	-3.5%	19.42 KB	19.08 KB	4.43 KB	4.28 KB	FB_WWW_DEV
ReactEventsPress-prod.js	-0.9%	-2.0%	16.04 KB	15.89 KB	3.34 KB	3.27 KB	FB_WWW_PROD
react-events-hover.development.js	-3.5%	-6.3%	9.47 KB	9.14 KB	2.36 KB	2.21 KB	UMD_DEV
react-events-hover.production.min.js	-1.6%	-2.0%	3.88 KB	3.82 KB	1.45 KB	1.42 KB	UMD_PROD
react-events-hover.development.js	-3.7%	-6.7%	9.3 KB	8.95 KB	2.32 KB	2.16 KB	NODE_DEV
react-events-hover.production.min.js	-2.0%	-3.0%	3.72 KB	3.65 KB	1.4 KB	1.36 KB	NODE_PROD
ReactEventsHover-dev.js	-3.6%	-6.8%	9.29 KB	8.96 KB	2.32 KB	2.16 KB	FB_WWW_DEV
ReactEventsHover-prod.js	-1.9%	-4.0%	7.68 KB	7.54 KB	1.82 KB	1.75 KB	FB_WWW_PROD
react-events-focus.development.js	-5.1%	-8.4%	6.63 KB	6.3 KB	1.81 KB	1.66 KB	UMD_DEV
react-events-focus.production.min.js	-1.9%	-2.7%	2.84 KB	2.78 KB	1.13 KB	1.09 KB	UMD_PROD
react-events-focus.development.js	-5.4%	-9.0%	6.46 KB	6.11 KB	1.75 KB	1.6 KB	NODE_DEV
react-events-focus.production.min.js	-2.8%	-4.2%	2.67 KB	2.59 KB	1.06 KB	1.02 KB	NODE_PROD
ReactEventsFocus-dev.js	-5.3%	-9.1%	6.43 KB	6.09 KB	1.75 KB	1.59 KB	FB_WWW_DEV
ReactEventsFocus-prod.js	-2.2%	-4.0%	5.34 KB	5.22 KB	1.34 KB	1.28 KB	FB_WWW_PROD
react-events-focus-scope.development.js	-6.6%	-9.9%	5.06 KB	4.72 KB	1.57 KB	1.41 KB	UMD_DEV
react-events-focus-scope.production.min.js	-2.8%	-2.4%	2.02 KB	1.96 KB	1003 B	979 B	UMD_PROD
react-events-focus-scope.development.js	-7.1%	-11.0%	4.88 KB	4.54 KB	1.52 KB	1.35 KB	NODE_DEV
react-events-focus-scope.production.min.js	-4.1%	-4.5%	1.84 KB	1.77 KB	934 B	892 B	NODE_PROD
ReactEventsFocusScope-dev.js	-6.8%	-10.9%	4.88 KB	4.54 KB	1.51 KB	1.35 KB	FB_WWW_DEV
ReactEventsFocusScope-prod.js	-3.1%	-4.5%	3.85 KB	3.73 KB	1.15 KB	1.1 KB	FB_WWW_PROD
react-events-swipe.development.js	-27.1%	-32.8%	8.39 KB	6.12 KB	2.56 KB	1.72 KB	UMD_DEV
react-events-swipe.production.min.js	-24.9%	-23.5%	3.51 KB	2.64 KB	1.6 KB	1.23 KB	UMD_PROD
react-events-swipe.development.js	-4.2%	-6.3%	8.22 KB	7.87 KB	2.53 KB	2.37 KB	NODE_DEV
react-events-swipe.production.min.js	-2.2%	-2.7%	3.35 KB	3.27 KB	1.55 KB	1.51 KB	NODE_PROD
ReactEventsSwipe-dev.js	-5.4%	-8.9%	6.32 KB	5.98 KB	1.79 KB	1.63 KB	FB_WWW_DEV
ReactEventsSwipe-prod.js	-2.6%	-4.7%	5.93 KB	5.78 KB	1.53 KB	1.46 KB	FB_WWW_PROD
react-events-drag.development.js	-28.7%	-34.7%	7.93 KB	5.66 KB	2.45 KB	1.6 KB	UMD_DEV
react-events-drag.production.min.js	-26.0%	-25.7%	3.37 KB	2.5 KB	1.53 KB	1.13 KB	UMD_PROD
react-events-drag.development.js	-4.5%	-6.6%	7.77 KB	7.42 KB	2.42 KB	2.26 KB	NODE_DEV
react-events-drag.production.min.js	-2.3%	-2.0%	3.21 KB	3.14 KB	1.46 KB	1.43 KB	NODE_PROD
ReactEventsDrag-dev.js	-5.6%	-9.1%	6.02 KB	5.68 KB	1.71 KB	1.55 KB	FB_WWW_DEV
ReactEventsDrag-prod.js	-2.8%	-4.8%	5.5 KB	5.34 KB	1.43 KB	1.36 KB	FB_WWW_PROD

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