Export split component as Split instead of separate ones

I've removed exports for `SplitViewHost` & `SplitViewScreen` in favour
of `Split.Host` & `Split.Column` / `Split.Inspector`.

The naming here is open for discussion. I prefer short version of `Split`
instead of `SplitView`, but that's matter of preference, can't find
reasonable (& clinching) arguments for one or the other.

Most important thing here is to just make it consistent. If we are to
use `View` suffix, then we should do similar thing for Stack ->
`StackView.Host` & `StackView.Screen`.

So it's either:

`Stack.Host`, `Stack.Screen`,
`Tabs.Host`, `Tabs.Screen`,
`Split.Host`, `Split.Column`, `Split.Inspector`

OR

`StackView.Host`, `StackView.Screen`,
`TabsView.Host`, `TabsView.Screen`,
`SplitView.Host`, `SplitView.Column`, `SplitView.Inspector`

OR MAYBE (?)

`Stack.HostView`, `Stack.ScreenView`,
`Tabs.HostView`, `Tabs.ScreenView`,
`Split.HostView`, `Split.ColumnView`, `Split.InspectorView`

Author: kkafar

src/components/gamma/split-view/index.ts

@@ -0,0 +1,13 @@
+import SplitViewHost from './SplitViewHost';
+import SplitViewScreen from './SplitViewScreen';
+
+export * from './SplitViewHost.types';
+export * from './SplitViewScreen.types';
+
+const Split = {
+  Host: SplitViewHost,
+  Column: SplitViewScreen.Column,
+  Inspector: SplitViewScreen.Inspector,
+};
+
+export default Split;

src/experimental/index.ts

@@ -13,6 +13,5 @@ export {
   StackScreenLifecycleState,
 } from '../components/gamma/stack';
 
-export { default as SplitViewHost } from '../components/gamma/split-view/SplitViewHost';
-export { default as SplitViewScreen } from '../components/gamma/split-view/SplitViewScreen';
+export { default as Split } from '../components/gamma/split-view/';
 export { default as SafeAreaView } from '../components/safe-area/SafeAreaView';