Add support for using DirectComposition with DirectX 12. #4
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This adds support for opting-in to using DirectComposition to manage interaction between a DXGI swapchain and a window, allowing for proper transparency support when using DirectX 12.
I tested this manually on my machine, by pointing a local build of Warp at my local copy of wgpu and setting the
use_dcompDX12 backend flag totrue.Controlling this via backend flag means we could have it be behind an experiment flag for a week or only enabled when window opacity is <100 or whatever we want to do to de-risk.