add `spirv-unknown-naga-wgsl` target via naga #492

Job	Run time
Difftest (windows-2022, x86_64-pc-windows-msvc)	19m 28s
Difftest (ubuntu-24.04, x86_64-unknown-linux-gnu)	10m 15s
Lint	6m 16s
cargo-deny	53s
Difftest (macOS-latest, aarch64-apple-darwin)	9m 43s
Test (macOS-latest, aarch64-apple-darwin)	9m 39s
Test (windows-2022, x86_64-pc-windows-msvc)	18m 33s
Android (ubuntu-24.04, aarch64-linux-android, x86_64-unknown-linux-gnu)	8m 17s
Test (ubuntu-24.04, x86_64-unknown-linux-gnu)	9m 26s
Compiletest (ubuntu-24.04, x86_64-unknown-linux-gnu, wgsl, true)	4m 28s
Compiletest (macOS-latest, aarch64-apple-darwin, vulkan1.1,vulkan1.2,vulkan1.3,vulkan1.4, false)	7m 22s
Compiletest (windows-2022, x86_64-pc-windows-msvc, vulkan1.1,vulkan1.2,vulkan1.3,vulkan1.4, false)	14m 28s
Compiletest (ubuntu-24.04, x86_64-unknown-linux-gnu, vulkan1.1,vulkan1.2,vulkan1.3,vulkan1.4, false)	7m 17s
test_success	4s
	2h 6m 9s

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