feat: Add new SetRelayServerData method to UnityTransport (#2235)

* feat: Add new SetRelayServerData method to UnityTransport

* Don't pass server data by reference

* Add PR number to CHANGELOG entry

Author: simon-lemay-unity

com.unity.netcode.gameobjects/CHANGELOG.md

@@ -11,6 +11,7 @@ Additional documentation and release notes are available at [Multiplayer Documen
 
 ### Added
 
+- `UnityTransport` now provides a way to set the Relay server data directly from the `RelayServerData` structure (provided by the Unity Transport package) throuh its `SetRelayServerData` method. This allows making use of the new APIs in UTP 1.3 that simplify integration of the Relay SDK. (#2235)
 - IPv6 is now supported for direct connections when using `UnityTransport`. (#2232)
 - Added WebSocket support when using UTP 2.0 with `UseWebSockets` property in the `UnityTransport` component of the `NetworkManager` allowing to pick WebSockets for communication. When building for WebGL, this selection happens automatically. (#2201)
 - Added position, rotation, and scale to the `ParentSyncMessage` which provides users the ability to specify the final values on the server-side when `OnNetworkObjectParentChanged` is invoked just before the message is created (when the `Transform` values are applied to the message). (#2146)

com.unity.netcode.gameobjects/Runtime/Transports/UTP/UnityTransport.cs

@@ -622,6 +622,14 @@ public void SetRelayServerData(string ipv4Address, ushort port, byte[] allocatio
             SetProtocol(ProtocolType.RelayUnityTransport);
         }
 
+        /// <summary>Set the relay server data (using the lower-level Unity Transport data structure).</summary>
+        /// <param name="serverData">Data for the Relay server to use.</param>
+        public void SetRelayServerData(RelayServerData serverData)
+        {
+            m_RelayServerData = serverData;
+            SetProtocol(ProtocolType.RelayUnityTransport);
+        }
+
         /// <summary>Set the relay server data for the host.</summary>
         /// <param name="ipAddress">IP address of the relay server.</param>
         /// <param name="port">UDP port of the relay server.</param>