Create skelethon methods to register idleCallbacks

[cipolleschi]

Summary: This change only adds skelethon methods to register and cancel the idle callbacks

Changelog

[internal] - add private methods to register callbacks, empty implementation

Differential Revision: D56472138

[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D56472138

[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D56472138

[analysis-bot]

Platform	Engine	Arch	Size (bytes)	Diff
android	hermes	arm64-v8a	19,410,907	+81
android	hermes	armeabi-v7a	n/a	--
android	hermes	x86	n/a	--
android	hermes	x86_64	n/a	--
android	jsc	arm64-v8a	22,784,326	+42
android	jsc	armeabi-v7a	n/a	--
android	jsc	x86	n/a	--
android	jsc	x86_64	n/a	--

Base commit: c884d19a501081ffbc4b353d751ecc3e32d6f624 Branch: main

[rubennorte]

I don't know why this wasn't closed automatically, but the change was abandoned.