fst: support eng hotword

雾聪

2023-12-12 3c83d64c84602de055f503af7d4e2761c829ec2e

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# The conformer transducer decoding configuration from @jeon30c
beam_size: 10
simu_streaming: false
streaming: true
chunk_size: 16
left_context: 16
right_context: 0