feat: add client name option for user identification in system events

Sources/Nats/NatsClient/NatsClientOptions.swift

@@ -31,8 +31,16 @@ public class NatsClientOptions {
     private var clientCertificate: URL? = nil
     private var clientKey: URL? = nil
     private var inboxPrefix: String = "_INBOX."
+    private var clientName: String = ""
 
     public init() {}
+    
+    /// Sets the client name sent to the server during CONNECT.
+    /// This name appears in system events and can be used to identify the client.
+    public func name(_ name: String) -> NatsClientOptions {
+        self.clientName = name
+        return self
+    }
 
     /// Sets the prefix for inbox subjects used for request/reply.
     /// Defaults to "_INBOX."
@@ -195,7 +203,8 @@ public class NatsClientOptions {
             clientCertificate: clientCertificate,
             clientKey: clientKey,
             rootCertificate: rootCertificate,
-            retryOnFailedConnect: initialReconnect
+            retryOnFailedConnect: initialReconnect,
+            name: clientName
         )
         return client
     }