Multiple passes

For denoising and temporal reprojection it would be useful to have multiple passes. For instance something like shadertoy, where one can bind different buffers to different passes, and different resources. I wanted to try adding something like this: https://www.shadertoy.com/view/ldKBzG

Start by reading the denoising and temporal reprojection paths, then study the linked Shadertoy example for its pass, buffer, and resource model. Define the multi-pass behavior and how completion will be demonstrated with a denoising or temporal reprojection example; the issue does not name specific files or tests.

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