Add showInsets method in IWindow

Add showInsets(types, fromIme) in IWindow in order for WM to be able to request
show for any of the InsetTypes.
Note: This will be used in followup CLs.

Bug: 139487540
Bug: 118118435
Test: Build passing

Change-Id: Ie988d0a234befa530ca236a3bb32c77d8a4dce21