feat(WebGPU): add Convolution2DPass - #3614
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Add the 2D convolution post process to the WebGPU backend. The pass renders its delegates into a color texture. Then it applies the kernel and writes the result to the swap chain. Add getCaptureDelegateOutput to the render pass base class. A parent pass that reads the color texture of its delegates returns true. The delegate then does not write to the swap chain. This makes a chain of passes possible. Scale the color by the alpha in the final blit. The swap chain uses premultiplied alpha.
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Add the 2D convolution post process to the WebGPU backend.
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npm run reformatto have correctly formatted codeTesting