libwebrtc: expose network_type on IceCandidateStats

.changeset/libwebrtc_network_type_stat.md

@@ -0,0 +1,12 @@
+---
+libwebrtc: minor
+livekit: patch
+livekit-ffi: patch
+---
+
+# Expose network_type on IceCandidateStats
+
+Chromium's local `RTCIceCandidateStats` carries a non-standard `networkType` field (WiFi,
+cellular, ethernet, etc.), but `IceCandidateStats` had no place to put it, so it was silently
+dropped during `get_stats()` deserialization. Adds `network_type: Option<String>` to the struct;
+non-breaking since it already derives `#[serde(default)]`.

libwebrtc/src/stats.rs

@@ -601,6 +601,9 @@ pub mod dictionaries {
         pub related_port: i32,
         pub username_fragment: String,
         pub tcp_type: Option<IceTcpCandidateType>,
+        /// Chromium's non-standard `RTCIceCandidateStats.networkType` (WiFi, cellular, ethernet,
+        /// etc.), reported only for local candidates.
+        pub network_type: Option<String>,
     }
 
     #[derive(Debug, Default, Clone, Deserialize)]