Add ai coustics feature usage (livekit#1324)

* Add ai coustics feature usage

* changeset

* generated protobuf

---------

Co-authored-by: github-actions <41898282+github-actions[bot]@users.noreply.github.com>

Author: lukasIO

.changeset/gentle-pants-warn.md

@@ -0,0 +1,6 @@
+---
+"github.com/livekit/protocol": patch
+"@livekit/protocol": patch
+---
+
+Add ai coustics feature usage

infra/link_grpc.pb.go

@@ -230,6 +230,7 @@ message FeatureUsageInfo {
   enum Feature {
     KRISP_NOISE_CANCELLATION = 0;
     KRISP_BACKGROUND_VOICE_CANCELLATION = 1;
+    AIC_AUDIO_ENHANCEMENT = 2;
   }
   Feature feature = 1;
   string project_id = 2;