feat: new `reactNativeProps` and `getDynamicReactNativeProps` in HTMLElementModels

`getDynamicReactNativeProps` allows you to create even richer model-based
custom renderers, since you can customize almost all native props from
just one function from a `TNode`.

`reactNativeProps` is similar, but static. It's still a great way to
customize accessibility and special text props such as `selectable`,
`numberOfLines`... etc.