feat: add campplus merge_thr (#2135)

Kun Lu

2024-10-15 db308e75357ae686f5103123f157a7f79887a103

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BAC009S0764W0121 <|NEUTRAL|>
BAC009S0916W0489 <|NEUTRAL|>
asr_example_cn_en <|NEUTRAL|>
ID0012W0014 <|NEUTRAL|>