ash: MyBuffer abstraction with explicit destroy #65

Job	Run time
xtask test & lint	7m 21s
lint (spirv-builder)	6m 3s
test (ubuntu-24.04, spirv-builder)	6m 42s
test (macOS-latest, spirv-builder)	7m 3s
lint (cargo-gpu)	7m 29s
test (ubuntu-24.04, cargo-gpu)	8m 35s
test (windows-2022, cargo-gpu)	13m 27s
test (windows-2022, spirv-builder)	9m 51s
test (macOS-latest, cargo-gpu)	7m 38s
test_success	3s
	1h 14m 12s

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