add where command to torchchat (#769) #232

Job	Run time
test-quantization-any / linux-job	15m 14s
test-quantization-cpu / linux-job	15m 17s
test-readme-any / linux-job	16m 54s
test-gguf-any / linux-job	17m 59s
test-readme-cpu / linux-job	16m 44s
	1h 22m 8s

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