MLE-30667 Added toString() override to ClientCookie (#1949)

Added a toString() override that returns `name + "=" + value`.

Author: jonmille

marklogic-client-api/src/main/java/com/marklogic/client/ClientCookie.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2010-2025 Progress Software Corporation and/or its subsidiaries or affiliates. All Rights Reserved.
+ * Copyright (c) 2010-2026 Progress Software Corporation and/or its subsidiaries or affiliates. All Rights Reserved.
  */
 package com.marklogic.client;
 
@@ -55,4 +55,9 @@ public int getMaxAge() {
 	public String getValue() {
 		return value;
 	}
+
+	@Override
+	public String toString() {
+		return name + "=" + value;
+	}
 }

marklogic-client-api/src/test/java/com/marklogic/client/test/ClientCookieTest.java

@@ -0,0 +1,25 @@
+/*
+ * Copyright (c) 2010-2026 Progress Software Corporation and/or its subsidiaries or affiliates. All Rights Reserved.
+ */
+package com.marklogic.client.test;
+
+import com.marklogic.client.ClientCookie;
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public class ClientCookieTest {
+
+    @Test
+    void toStringReturnsNameEqualsValue() {
+        ClientCookie cookie = new ClientCookie("HostId", "abc123", Long.MAX_VALUE, "localhost", "/", false);
+        assertEquals("HostId=abc123", cookie.toString(),
+            "ClientCookie.toString() must return name=value for correct Cookie header formatting");
+    }
+
+    @Test
+    void toStringWithEmptyValue() {
+        ClientCookie cookie = new ClientCookie("SessionId", "", Long.MAX_VALUE, "localhost", "/", false);
+        assertEquals("SessionId=", cookie.toString());
+    }
+}