Add an API to control the focusability of the View in SurfaceControlViewHost

In addition, this change introduces a `LayoutParams` class to expose a
subset of WindowManager.LayoutParams to set on the
`SurfaceControlViewHost` hosted view. This will allow us to expose more
attributes to `SurfaceControlViewHost` as needed.

Bug: 425415517, 442659996
Test: presubmit
Flag: com.android.window.flags.scvh_set_focusable
Change-Id: Ib3c8d00ffc8e75e781a5749482faf167548f0f05