Improve spec-compliance of bridgeless timer implementation

[javache]

Summary:

• setInterval's second argument is optional, and defaults to 0
• setTimeout is spec'ed to return a positive integer.

There's also no need to use HostObjects here to represent the timer index, it just hurts performance and makes this code more complex for no clear reason.

Changelog: [General][Fixed] New architecture timer methods now return integers instead of an opaque object.

Differential Revision: D56863422

[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D56863422

[analysis-bot]

Platform	Engine	Arch	Size (bytes)	Diff
android	hermes	arm64-v8a	19,511,401	-16,384
android	hermes	armeabi-v7a	n/a	--
android	hermes	x86	n/a	--
android	hermes	x86_64	n/a	--
android	jsc	arm64-v8a	22,883,928	-16,419
android	jsc	armeabi-v7a	n/a	--
android	jsc	x86	n/a	--
android	jsc	x86_64	n/a	--

Base commit: eb1b42fa8b2834bebb9eb5b31201e6c20ae575fe Branch: main

[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D56863422

[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D56863422

[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D56863422

[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D56863422

[facebook-github-bot]

This pull request has been merged in facebook/react-native@a16f7dc547e85daed7e3732142f36cce5699faa0.

[github-actions[bot]]

This pull request was successfully merged by @javache in a16f7dc547e85daed7e3732142f36cce5699faa0.

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