support ngram and fst hotword for 2pass-offline (#1205)

Yabin Li

2023-12-26 b8825902d93d5017e44828316062dc8306b7ddcd

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한시    01
두시    02
세시    03
네시    04
다섯시    05
여섯시    06
일곱시    07
여덟시    08
아홉시    09
열시    10
열한시    11
열두시    12