Use CB as backend #1440

Job	Run time
cpp-multinomial-greedy_causal_lm-ubuntu	9m 30s
cpp-greedy_causal_lm-windows	22m 24s
cpp-beam_search_causal_lm-Qwen-7B-Chat	11m 44s
cpp-beam_search_causal_lm-ubuntu (./build/samples/cpp/beam_search_causal_lm/beam_search_causal_lm)	12m 37s
cpp-beam_search_causal_lm-ubuntu (python ./samples/python/beam_search_causal_lm/beam_search_causa...	11m 21s
cpp-beam_search_causal_lm-notus-7b-v1	11m 29s
cpp-beam_search_causal_lm-Phi-2	7m 16s
cpp-beam_search_causal_lm-Qwen1_5-7B-Chat	10m 8s
cpp-chat_sample-ubuntu	10m 54s
cpp-continuous-batching-macos	14m 58s
cpp-continuous-batching-ubuntu	10m 39s
cpp-continuous-batching-windows	18m 50s
cpp-greedy_causal_lm-redpajama-3b-chat	16m 17s
cpp-Phi-1_5	8m 26s
cpp-prompt_lookup_decoding_lm-ubuntu	7m 2s
cpp-speculative_decoding_lm-ubuntu	10m 52s
	3h 14m 27s

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