Support silero_vad version 5

[csukuangfj]

Intro

The PR
snakers4/silero-vad#468
releases a new version of silero vad, i.e., version 5, which has a different programming interface from version 4.

This PR supports silero VAD v5. It is also compatible with silero VAD v4.

Usage

git clone https://github.com/k2-fsa/sherpa-onnx
cd sherpa-onnx
mkdir build
cd build
cmake ..
make

wget https://github.com/snakers4/silero-vad/raw/master/files/silero_vad.onnx

./bin/sherpa-onnx-vad-microphone --silero-vad-model=./silero_vad.onnx

For APIs of other languages, e.g., python, please see
https://github.com/k2-fsa/sherpa-onnx/tree/master/python-api-examples