Add support for WebRTC Auto Gain and Noise Suppression (#250)

## WebRTC Auto Gain & Noise Suppression
 
This PR adds support for WebRTC Auto Gain and Noise Suppression as previously implemented in the Wyoming Satellite project.
 
### What's New
 
Two new entities have been created a number slider for gain and another one for noise suppression. The processing happens inside of the `webrtc.py` file and is implemented in the `__main__.py` file's `process_audio` function. The slider for gain has a limit of 0-31 and noise suppression has a limit of 0-4.
 
The Auto Gain and Noise Suppression persist through restarts and are saved as preferences. The values are dynamically chnged without needing a restart.
 
CLI flags called `--mic-auto-gain` and `--mic-noise-suppression` have also been added.
 
>  When both values are 0, WebRTC processing is bypassed entirely with no performance overhead.

Closes #25 
 
### Testing
 
When saving the audio recorded by LVA there is a noticeable increase. The following two files have been recorded with similar audio being played through them with these results (Gain-31 and NS-4):
 
| Metric | With AGC+NS | Without |
|---|---|---|
| Max amplitude | 0.329 | 0.054 |
| RMS amplitude | 0.008905 | 0.002862 |
| Volume adjustment needed | 3.034x | 13.479x |
| Rough frequency | 916 Hz | 705 Hz |

docker-entrypoint.sh

@@ -40,6 +40,14 @@ if [ -n "${AUDIO_OUTPUT_DEVICE}" ]; then
   EXTRA_ARGS+=( "--audio-output-device" "$AUDIO_OUTPUT_DEVICE" )
 fi
 
+if [ -n "${MIC_AUTO_GAIN}" ]; then
+  EXTRA_ARGS+=( "--mic-auto-gain" "$MIC_AUTO_GAIN" )
+fi
+
+if [ -n "${MIC_NOISE_SUPPRESSION}" ]; then
+  EXTRA_ARGS+=( "--mic-noise-suppression" "$MIC_NOISE_SUPPRESSION" )
+fi
+
 if [ "$ENABLE_THINKING_SOUND" = "1" ]; then
   EXTRA_ARGS+=( "--enable-thinking-sound" )
 fi