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Draft: render/vulkan: use stage buffers for read_pixels

Simon Ser requested to merge emersion/wlroots:vk-read-pixels-stage-buf into master

No need to roll our own cache machinery here, stage buffers already do it (and more) for us. Should improve performance when multiple screens with a different resolution are captured.

Closes: #3525

TODO: with this we loose VK_MEMORY_PROPERTY_HOST_CACHED_BIT.

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