[Android] Add onUserLeaveHint support to ReactActivityDelegate

[behenate]

Summary:

This is a resubmission of the previous PRs. We are trying to figure out why it causes crashes in some apps.

This PR adds onUserLeaveHint support into the ReactActivityDelegate. It allows modules to receive an event every time user moves the app into the background. This is slightly different than onPause - it's called only when the user intentionally moves the app into the background, e.g. when receiving a call onPause should be called but onUserLeaveHint shouldn't.

This feature is especially useful for libraries implementing features like Picture in Picture (PiP), where using onUserLeaveHint is the recommended way of auto-entering PiP for android < 12.

Changelog:

[ANDROID] [ADDED] - Added onUserLeaveHint support into ReactActivityDelegate

Test Plan:

Tested in the rn-tester app - callbacks are correctly called on both old and new architecture.

[analysis-bot]

Platform	Engine	Arch	Size (bytes)	Diff
android	hermes	arm64-v8a	18,073,881	-376,780
android	hermes	armeabi-v7a	n/a	--
android	hermes	x86	n/a	--
android	hermes	x86_64	n/a	--
android	jsc	arm64-v8a	21,440,617	-375,017
android	jsc	armeabi-v7a	n/a	--
android	jsc	x86	n/a	--
android	jsc	x86_64	n/a	--

Base commit: 6d0f72b
Branch: main

[behenate]

@cortinico Any updates on the source of the crashes?

[cortinico]

@cortinico Any updates on the source of the crashes?

I haven't had the time to test again sorry. Hopefully I should have an answer by next week

[facebook-github-bot]

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