Implement selectable property for Text for fabric

[jonthysell]

Implement the selectable property for the fabric implementation of Text.

This property was available in RNW Paper via TextViewManager.

See https://reactnative.dev/docs/text#selectable for details.

[iamAbhi-916]

This can be fixed when upstream react-native fixes their macro conversion of selectable prop from JS to native.
Added PR for the same :
Text: Fix selectable prop mapping (was isSelectable) for Fabric - ensure correct macro conversion by iamAbhi-916 · Pull Request #51187 · facebook/react-native

After teh above is merged and integrated to RNW , then we need to add pointer/touch handlers in ParagraphComponentView that, when selectable is true, allow the user to select text