Add method to specify a custom timeout

[cipolleschi]

Summary: The RuntimeScheduler now has some fixed timouts depending on the priority selected when scheduling a task.

However, some JS APIs like the requestIdleCallback allow the user to specify a custom timeout for the task. This change introduces this new APIs

Changelog:

[General][Added] - Add APIs to specify a custom timeout in the Runtime Scheduler

Differential Revision: D56476044

[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D56476044

[analysis-bot]

Platform	Engine	Arch	Size (bytes)	Diff
android	hermes	arm64-v8a	19,476,479	+32,786
android	hermes	armeabi-v7a	n/a	--
android	hermes	x86	n/a	--
android	hermes	x86_64	n/a	--
android	jsc	arm64-v8a	22,849,938	+32,782
android	jsc	armeabi-v7a	n/a	--
android	jsc	x86	n/a	--
android	jsc	x86_64	n/a	--

Base commit: 78ab5f4b836d64b71760754c7cce1315630640c7 Branch: main

[cipolleschi]

Abandoned internally