Add benchmarking script (#20188) #727

Job	Run time
test-webgpu / test-backend-linux (webgpu, models) / linux-job	5m 35s
test-webgpu / test-backend-macos	0s
test-webgpu / test-backend-linux (webgpu, operators) / linux-job	5m 13s
test-webgpu / package-golden-artifacts	1s
	10m 49s

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