Refactor AttributeGraphVendor to RawRepresentable struct (#222) #43

Job	Run time
Build with Compute (binary) on macOS (macos-15, 16.4)	41s
Build with Compute (source) on Ubuntu (6.2)	1m 22s
Build with Compute (binary) on iOS (macos-15, 16.4, 18.5)	53s
	2m 56s

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