feat: Add space-separated string support for fontVariant

[gabrieldonadel]

Summary

This updates fontVariant to support space-separated string values, i.e., 'small-caps common-ligatures', thus aligning it with the CSS Fonts Module Level 4 specification as requested on #34425. This also adds unit tests to the processFontVariant function ensuring the style processing works as expected.

Changelog

[General] [Added] - Add space-separated string support for fontVariant

Test Plan

This can be tested either through processFontVariant-tests or by using the following code:

<Textstyle={{fontVariant: 'small-caps common-ligatures',}}/>

[analysis-bot]

Platform	Engine	Arch	Size (bytes)	Diff
android	hermes	arm64-v8a	7,642,346	-39,267
android	hermes	armeabi-v7a	7,054,430	-31,943
android	hermes	x86	7,943,926	-40,744
android	hermes	x86_64	7,915,954	-41,622
android	jsc	arm64-v8a	9,514,689	-38,652
android	jsc	armeabi-v7a	8,290,301	-31,306
android	jsc	x86	9,454,026	-40,121
android	jsc	x86_64	10,045,097	-40,987

Base commit: bfb36c2
Branch: main

[analysis-bot]

Platform	Engine	Arch	Size (bytes)	Diff
ios	-	universal	n/a	--

Base commit: bfb36c2
Branch: main

[facebook-github-bot]

@cipolleschi has imported this pull request. If you are a Meta employee, you can view this diff on Phabricator.

[cipolleschi]

Quoting @javache:

Can we avoid regular expressions here since it's just a string split by space? This also seems like it would cause the regex to be re-compiled on every process call.

[gabrieldonadel]

Sure, let me update this

[gabrieldonadel]

FIxed @cipolleschi

[facebook-github-bot]

@cipolleschi has imported this pull request. If you are a Meta employee, you can view this diff on Phabricator.

[react-native-bot]

This pull request was successfully merged by @gabrieldonadel in 09d4207.

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