add `spirv-unknown-naga-wgsl` target via naga #579

Job	Run time
Test (macOS-latest)	11m 49s
Android (ubuntu-24.04, aarch64-linux-android)	8m 39s
Test (ubuntu-24.04)	9m 51s
Test (windows-2022)	16m 21s
cargo-deny	1m 0s
Difftest (windows-2022)	19m 51s
Difftest (ubuntu-24.04)	11m 24s
Difftest (macOS-latest)	10m 25s
Compiletest (windows-2022, vulkan1.1,vulkan1.2,vulkan1.3,vulkan1.4, false)	14m 30s
Compiletest (ubuntu-24.04, wgsl, true)	4m 46s
Compiletest (ubuntu-24.04, vulkan1.1,vulkan1.2,vulkan1.3,vulkan1.4, false)	7m 26s
Compiletest (macOS-latest, vulkan1.1,vulkan1.2,vulkan1.3,vulkan1.4, false)	6m 46s
Lint	6m 27s
test_success	2s
	2h 9m 17s

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