feat: text nested variants

[jpudysz]

Summary

Fixes an issue reported on Discord.
If there are two text nodes with a parent <-> child relationship, there was a bug where the child's variants would override the parent's variants. This PR fixes that by ensuring variants are rolled out from the child to the parent, so every node now has the correct variant attached. It also supports cases where React Native Text nodes inherit parent styles, similar to regular React Native behavior.

For:

<React.Fragment>
      <ThemedText type="title">
        Parent
        <ThemedText>
          Amother ThemedText
        </ThemedText>
      </ThemedText>
      <ThemedText type="title">
        Parent
        <Text>
          RN Text
        </Text>
      </ThemedText>
</React.Fragment>

We should get following result:

Requires regression testing before merging for #433

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Name	Status	Preview	Comments	Updated (UTC)
react-native-unistyles-2.0	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Dec 15, 2024 2:57pm
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[jpudysz]

Looks good with variants nested Pressables regression