Rename press props in experimental event API

[necolas]

Note: this is for an experimental event API that we're testing out internally at Facebook.

• onPressIn -> onPressStart
• onPressOut -> onPressEnd
• longPressCancelsPress -> onLongPressShouldCancelPress

Ref #15257

[sizebot]

Details of bundled changes.

Comparing: 08055a6...a20fd1e

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	618 B	617 B	UMD_DEV
react-events.production.min.js	0.0%	-0.2%	682 B	682 B	431 B	430 B	UMD_PROD
react-events.development.js	0.0%	-0.2%	996 B	996 B	556 B	555 B	NODE_DEV
react-events.production.min.js	0.0%	-0.3%	512 B	512 B	354 B	353 B	NODE_PROD
react-events-press.development.js	+5.0%	+5.2%	9.94 KB	10.44 KB	2.47 KB	2.6 KB	UMD_DEV
react-events-press.production.min.js	🔺+8.1%	🔺+5.9%	3.94 KB	4.26 KB	1.43 KB	1.51 KB	UMD_PROD
react-events-press.development.js	+5.1%	+5.2%	9.77 KB	10.27 KB	2.43 KB	2.55 KB	NODE_DEV
react-events-press.production.min.js	🔺+8.5%	🔺+5.8%	3.78 KB	4.1 KB	1.39 KB	1.47 KB	NODE_PROD
ReactEventsPress-dev.js	+6.9%	+6.3%	9.85 KB	10.52 KB	2.44 KB	2.59 KB	FB_WWW_DEV
ReactEventsPress-prod.js	🔺+7.9%	🔺+9.4%	7.78 KB	8.4 KB	1.76 KB	1.92 KB	FB_WWW_PROD
react-events-hover.development.js	0.0%	-0.1%	4.73 KB	4.73 KB	1.33 KB	1.32 KB	UMD_DEV
react-events-hover.production.min.js	0.0%	-0.2%	2.12 KB	2.12 KB	904 B	902 B	UMD_PROD
react-events-hover.development.js	0.0%	-0.1%	4.56 KB	4.56 KB	1.28 KB	1.28 KB	NODE_DEV
react-events-hover.production.min.js	0.0%	-0.2%	1.95 KB	1.95 KB	846 B	844 B	NODE_PROD
react-events-focus.development.js	0.0%	-0.1%	2.95 KB	2.95 KB	1.02 KB	1.02 KB	UMD_DEV
react-events-focus.production.min.js	0.0%	-0.3%	1.39 KB	1.39 KB	678 B	676 B	UMD_PROD
react-events-focus.development.js	0.0%	-0.1%	2.78 KB	2.78 KB	993 B	992 B	NODE_DEV
react-events-focus.production.min.js	0.0%	-0.3%	1.22 KB	1.22 KB	615 B	613 B	NODE_PROD
react-events-swipe.development.js	0.0%	-0.1%	5.98 KB	5.98 KB	1.73 KB	1.72 KB	UMD_DEV
react-events-swipe.production.min.js	0.0%	-0.2%	2.59 KB	2.59 KB	1.15 KB	1.15 KB	UMD_PROD
react-events-swipe.development.js	0.0%	-0.1%	5.81 KB	5.81 KB	1.68 KB	1.68 KB	NODE_DEV
react-events-swipe.production.min.js	0.0%	-0.2%	2.43 KB	2.43 KB	1.09 KB	1.09 KB	NODE_PROD
react-events-drag.development.js	0.0%	-0.1%	5.27 KB	5.27 KB	1.57 KB	1.57 KB	UMD_DEV
react-events-drag.production.min.js	0.0%	-0.2%	2.33 KB	2.33 KB	1 KB	1 KB	UMD_PROD
react-events-drag.development.js	0.0%	-0.1%	5.1 KB	5.1 KB	1.53 KB	1.53 KB	NODE_DEV
react-events-drag.production.min.js	0.0%	-0.2%	2.17 KB	2.17 KB	973 B	971 B	NODE_PROD

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[trueadm]

LGTM