add `spirv-unknown-naga-wgsl` target via naga #548

Job	Run time
Lint	6m 26s
cargo-deny	1m 2s
Android (ubuntu-24.04, aarch64-linux-android)	8m 2s
Test (macOS-latest)	9m 0s
Difftest (windows-2022)	19m 14s
Difftest (ubuntu-24.04)	10m 6s
Test (ubuntu-24.04)	9m 29s
Test (windows-2022)	18m 26s
Difftest (macOS-latest)	15m 48s
Compiletest (ubuntu-24.04, vulkan1.1, false)	4m 40s
Compiletest (ubuntu-24.04, vulkan1.3, false)	4m 39s
Compiletest (ubuntu-24.04, vulkan1.4, false)	4m 43s
Compiletest (ubuntu-24.04, vulkan1.2, false)	4m 43s
Compiletest (windows-2022, vulkan1.3, false)	9m 28s
Compiletest (windows-2022, vulkan1.1, false)	9m 55s
Compiletest (ubuntu-24.04, wgsl, true)	4m 32s
Compiletest (macOS-latest, vulkan1.3, false)	4m 56s
Compiletest (windows-2022, vulkan1.4, false)	9m 33s
Compiletest (macOS-latest, vulkan1.1, false)	4m 29s
Compiletest (windows-2022, vulkan1.2, false)	9m 59s
Compiletest (macOS-latest, vulkan1.4, false)	6m 38s
Compiletest (macOS-latest, vulkan1.2, false)	4m 15s
test_success	3s
	3h 0m 6s

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