Can we create ScreenViewFactory.forWrapperScreen?

[rjrjr]

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These four lines happen a lot.

ScreenViewFactory.forBuiltView<BackButtonScreen<W>> {
     initialRendering, initialEnv, context, container ->
       initialRendering.wrapped.toViewFactory(initialEnv)
         .unwrapping<BackButtonScreen<W>, W>(

I wonder if we can do better.

fun <WrapperT, WrappedT> ScreenViewFactory.forWrapperScreen(
  unwrap: (WrapperT) -> WrappedT,
  maybe: (ScreenViewFactory<WrappedT>) -> ScreenViewHolder<WrapperT>.
)

Not in this PR.

Originally posted by @rjrjr in https://github.com/square/workflow-kotlin/pull/712#discussion_r838933754