Fix experimental audio, add denoise, auto volume.Prep migration (#38874)

Uses the previously merged denoising crate (and fixes a bug in it that
snug in during refactoring) to add denoising to the microphone input. 

Adds automatic volume control for microphone and output.

Prepares for migrating to 16kHz SR mono:
The experimental audio path now picks the samplerate and channel count depending on a setting. It can handle incoming streams with both the current (future legacy) and new samplerate & channel count. These are url-encoded into the livekit track name

Release Notes:

- N/A

assets/settings/default.json

@@ -411,15 +411,33 @@
     "experimental.rodio_audio": false,
     // Requires 'rodio_audio: true'
     //
-    // Use the new audio systems automatic gain control for your microphone.
-    // This affects how loud you sound to others.
-    "experimental.control_input_volume": false,
+    // Automatically increase or decrease you microphone's volume. This affects how
+    // loud you sound to others.
+    //
+    // Recommended: off (default)
+    // Microphones are too quite in zed, until everyone is on experimental
+    // audio and has auto speaker volume on this will make you very loud
+    // compared to other speakers.
+    "experimental.auto_microphone_volume": false,
     // Requires 'rodio_audio: true'
     //
-    // Use the new audio systems automatic gain control on everyone in the
-    // call. This makes call members who are too quite louder and those who are
-    // too loud quieter. This only affects how things sound for you.
-    "experimental.control_output_volume": false
+    // Automatically increate or decrease the volume of other call members.
+    // This only affects how things sound for you.
+    "experimental.auto_speaker_volume": true,
+    // Requires 'rodio_audio: true'
+    //
+    // Remove background noises. Works great for typing, cars, dogs, AC. Does
+    // not work well on music.
+    "experimental.denoise": true,
+    // Requires 'rodio_audio: true'
+    //
+    // Use audio parameters compatible with the previous versions of
+    // experimental audio and non-experimental audio. When this is false you
+    // will sound strange to anyone not on the latest experimental audio. In
+    // the future we will migrate by setting this to false
+    //
+    // You need to rejoin a call for this setting to apply
+    "experimental.legacy_audio_compatible": true
   },
   // Scrollbar related settings
   "scrollbar": {