optimize ComputeDecibel in fsmn-vad model by using numpy (#2174)

StevenH

2024-10-26 1254e8aee1e3200acc2b4752c6822bfc1a21b22f

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add_library(csrc STATIC
        feature-fbank.cc
        feature-functions.cc
        feature-window.cc
        fftsg.c
        mel-computations.cc
        online-feature.cc
        rfft.cc)