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

Yabin Li

2023-12-26 b8825902d93d5017e44828316062dc8306b7ddcd

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// See www.openfst.org for extensive documentation on this weighted
// finite-state transducer library.
 
#include <fst/extensions/linear/linear-fst.h>
#include <fst/register.h>
 
using fst::LinearClassifierFst;
using fst::StdArc;
using fst::LogArc;
 
REGISTER_FST(LinearClassifierFst, StdArc);
REGISTER_FST(LinearClassifierFst, LogArc);