Split SVG stuff from other utils

[natew]

I'd be happy to contribute this one - we could create a @react-native-redash/core in this repo with all the non-svg stuff, and then import that and add the extra svg stuff to react-native-redash.

That would let people import core for stuff that doesn't need the svg utils. I've had a variety of bundler issues with @gorhom/bottom-sheet because it depends on this library (due to the svg libs). This would let us fix that up.