Add int4_matmul.py to triton_kernels srcs #3863

Job	Run time
test-vulkan / test-backend-linux (vulkan, models) / linux-job	20m 23s
test-vulkan / test-backend-linux (vulkan, operators) / linux-job	20m 39s
test-vulkan / test-backend-macos	-1s
test-vulkan / package-golden-artifacts	3m 37s
	44m 38s

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