Plugins/Extensions
camera.ui own plugins to exclude extensions from the actual codebase

This would have the advantage that users only load the extensions they need

## Plugins

- [x]  https://github.com/seydx/homebridge-camera-ui/issues/489
- [ ]  https://github.com/seydx/homebridge-camera-ui/issues/380
- [x]  RTSP
- [x]  Sound Detection
- [x]  MQTT
- [x]  FTP
- [x]  SMTP
- [x] HTTP (motion)
- [x]  Alexa Speech
- [x]  Telegram
- [x]  Webhook
- [x] WebPush
- [x] AWS Rekognition
- [x] Videoanalysis
- [ ]  Tensorflow