refactor: replace findNodeHandle for getRefNativeTag

[AndreiCalazans]

Motivation

Make this library compliant with the new Fabric architecture. Follow up to the Fabric enabled example app.

Gif of it working with old architecture:

Gif of it working with Fabric: (note example app is slightly broken due to dependencies not being fully compatible yet)

cc @gorhom

[gorhom]

thanks @AndreiCalazans for submitting this PR

[smontlouis]

It's broken on expo-web

Uncaught Error: Unexpected nativeTag: function; nativeTag=[object HTMLDivElement] 

			createBottomSheetScrollableComponent's ScrollableComponent needs to return 
			a reference that contains a nativeTag to a Native HostComponent.

ref=function _f(component) {
        if (component) {
          tag.value = Object(_NativeMethods__WEBPACK_IMPORTED_MODULE_1__["getTag"])(component);
          fun.current = component;
        }

        return tag.value;
      }

[giaset]

Having the same issue as @smontlouis on web