feat/VAD_plugins

[NeonJarbas]

companion PR to OpenVoiceOS/ovos-core#81

adds base class and utils for VAD plugins

test with

• https://github.com/OpenVoiceOS/ovos-vad-plugin-silero
• https://github.com/OpenVoiceOS/ovos-vad-plugin-webrtcvad

[codecov]

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