feat: making NetworkBehaviour's IsServer, IsClient, IsHost public (#2352)

Author: jeffreyrainy

com.unity.netcode.gameobjects/Runtime/Core/NetworkBehaviour.cs

@@ -314,18 +314,18 @@ public NetworkManager NetworkManager
         /// <summary>
         /// Gets if we are executing as server
         /// </summary>
-        protected bool IsServer { get; private set; }
+        public bool IsServer { get; private set; }
 
         /// <summary>
         /// Gets if we are executing as client
         /// </summary>
-        protected bool IsClient { get; private set; }
+        public bool IsClient { get; private set; }
 
 
         /// <summary>
         /// Gets if we are executing as Host, I.E Server and Client
         /// </summary>
-        protected bool IsHost { get; private set; }
+        public bool IsHost { get; private set; }
 
         /// <summary>
         /// Gets Whether or not the object has a owner