Switch from push constants to storage buffers #60

Job	Run time
xtask test & lint	1m 40s
lint (spirv-builder)	1m 39s
test (macOS-latest, cargo-gpu)	1m 46s
test (ubuntu-24.04, cargo-gpu)	1m 44s
test (macOS-latest, spirv-builder)	1m 52s
lint (cargo-gpu)	1m 44s
test (windows-2022, cargo-gpu)	1m 41s
test (windows-2022, spirv-builder)	1m 41s
test (ubuntu-24.04, spirv-builder)	1m 39s
test_success	2s
	15m 28s

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