macOS: Add native interface API to manage visual effect viewHEADdev

NSVisualEffectView is the only supported way to add effects to views, such as showing a blurred representation of the content under the window, or within the window. Now that we render the content of our QNSView into a sublayer of the view's root layer, we can add NSVisualEffectViews as child views without obscuring the view's own content, by making sure that the NSVisualEffectView layer has a lower Z order in the layer tree of our view's root layer. This works because adding a layer-backed or -hosted view as a subview will also add its layer as a sublayer of the view's layer, making the effect layer and our content layer sibling layers. Change-Id: Iab822e8462f54025559b3e3f26c7df668c885d75 Reviewed-by: Richard Moe Gustavsen <richard.gustavsen@qt.io> 

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