Add TypeScript declarations for requestIdleCallback and cancelIdleCal… #275

Job	Run time
determine_mode	2s
set_hermes_version	-1s
publish_bumped_packages	1m 3s
build_android	0s
prebuild_apple_dependencies	0s
prebuild_react_native_core	0s
publish_react_native	0s
post_publish	0s
generate_changelog	0s
create_draft_release	0s
bump_podfile_lock	0s
	1m 4s

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