add ctc inference code (#1806)

zhifu gao

2024-06-11 997374b88fe6b2ae5cb4dcaf47d78cb3eff09fc2

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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)