dxgi: Introduce IWineDXGIDeviceParent::register_swapchain_texture() and use it in IDXGIDevice::CreateSurface().

Instead of having d3d11 create the wined3d texture, create it in dxgi instead,
and let d3d11 create a d3d_texture2d object to wrap it.

This is a step towards getting rid of the create_swapchain_texture() callback,
which is mildly difficult to work with and conceptually complex.