[CB] Simplify SequenceGroup API #6231

Job	Run time
cpp-greedy_causal_lm-windows	27m 30s
cpp-beam_search_causal_lm-ubuntu (./build/samples/cpp/beam_search_causal_lm/beam_search_causal_lm)	18m 46s
cpp-beam_search_causal_lm-ubuntu (python ./samples/python/beam_search_causal_lm/beam_search_causa...	17m 18s
cpp-beam_search_causal_lm-Phi-2	16m 12s
cpp-beam_search_causal_lm-notus-7b-v1	31m 12s
cpp-beam_search_causal_lm-Qwen1_5-7B-Chat	33m 14s
cpp-greedy_causal_lm-Qwen-7B-Chat	10m 50s
cpp-multinomial-greedy_causal_lm-ubuntu	18m 20s
cpp-prompt_lookup_decoding_lm-ubuntu	11m 24s
cpp-speculative_decoding_lm-ubuntu	13m 9s
cpp-chat_sample-ubuntu	16m 10s
cpp-continuous-batching-macos	21m 6s
cpp-continuous-batching-ubuntu	15m 44s
cpp-greedy_causal_lm-redpajama-3b-chat	11m 16s
cpp-continuous-batching-windows	27m 25s
cpp-Phi-1_5	8m 51s
visual_language_chat_sample-ubuntu-internvl2	14m 24s
visual_language_chat_sample-ubuntu-minicpm_v2_6	7m 0s
visual_language_chat_sample-ubuntu-llava_1_5 / visual_language_chat_sample-ubuntu-llava	31m 8s
visual_language_chat_sample-ubuntu-llava_next / visual_language_chat_sample-ubuntu-llava	35m 58s
ci/gha_overall_status_causal_lm	1s
	6h 26m 58s

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