[CB] Simplify SequenceGroup API (#1456) #6233

Job	Run time
cpp-beam_search_causal_lm-notus-7b-v1	31m 42s
cpp-beam_search_causal_lm-Phi-2	16m 39s
cpp-beam_search_causal_lm-Qwen1_5-7B-Chat	32m 55s
cpp-beam_search_causal_lm-ubuntu (./build/samples/cpp/beam_search_causal_lm/beam_search_causal_lm)	19m 52s
cpp-chat_sample-ubuntu	13m 41s
cpp-beam_search_causal_lm-ubuntu (python ./samples/python/beam_search_causal_lm/beam_search_causa...	17m 38s
cpp-continuous-batching-macos	19m 55s
cpp-continuous-batching-ubuntu	15m 3s
cpp-continuous-batching-windows	28m 22s
cpp-greedy_causal_lm-Qwen-7B-Chat	10m 41s
cpp-greedy_causal_lm-redpajama-3b-chat	10m 55s
cpp-greedy_causal_lm-windows	35m 26s
cpp-multinomial-greedy_causal_lm-ubuntu	14m 35s
cpp-Phi-1_5	8m 23s
cpp-prompt_lookup_decoding_lm-ubuntu	11m 33s
cpp-speculative_decoding_lm-ubuntu	14m 11s
visual_language_chat_sample-ubuntu-internvl2	24m 1s
visual_language_chat_sample-ubuntu-minicpm_v2_6	8m 26s
visual_language_chat_sample-ubuntu-llava_1_5 / visual_language_chat_sample-ubuntu-llava	14m 4s
visual_language_chat_sample-ubuntu-llava_next / visual_language_chat_sample-ubuntu-llava	35m 42s
ci/gha_overall_status_causal_lm	1s
	6h 23m 45s

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