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](https://drafts.csswg.org/css-fonts/#font-variant-prop) specification as requested on https://github.com/facebook/react-native/issues/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
Pull Request resolved: https://github.com/facebook/react-native/pull/34641
Test Plan:
This can be tested either through `processFontVariant-tests` or by using the following code:
```js
<Text
style={{
fontVariant: 'small-caps common-ligatures',
}} />
```
Reviewed By: javache
Differential Revision: D39423317
Pulled By: cipolleschi
fbshipit-source-id: ad971addb423ed338e178528a11fe9d456c03e6e
Gabriel Donadel Dall'Agnol