Add rms_norm op (#19893) #1

Job	Run time
test-webgpu / test-backend-linux (webgpu, models) / linux-job	8m 27s
test-webgpu / test-backend-linux (webgpu, operators) / linux-job	8m 22s
test-webgpu / test-backend-macos	0s
test-webgpu / package-golden-artifacts	-1s
	16m 48s

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