Introduce WindowManagerWrapper

Add WindowManagerWrapper to enable WindowContext
to use ViewCaptureAwareWindowManager.
Previously, ViewCaptureAwareWm extended WindowManagerImpl, which led to
WindowContext failed to attach the window to ViewCaptureAwareWm.
This CL adds a WM wrapper to ViewCaptureAwareWM can be used by
WindowContext.

Test: atest WindowManagerWrapperTest
Bug: 406318166
Flag: com.android.systemui.enable_view_capture_tracing
Change-Id: I22d5f28700317f39fbaeb3b9db0e3fe78d87b2b7