feat: add constructor to set clientId on Client creation

Add new constructor Client(String name, String clientId) to allow
setting the immutable clientId field during object construction.

The existing Client(String name) constructor remains unchanged to
maintain backward compatibility. This allows users to optionally
set the clientId at construction time when needed, while the field
remains immutable (no setter exists).

- Add Client(String name, String clientId) constructor with JavaDoc
- Add test for backward compatibility (existing constructor)
- Add test for new constructor functionality
- All existing tests continue to pass

Author: adenix

src/main/java/com/auth0/json/mgmt/client/Client.java

@@ -154,6 +154,17 @@ public Client(@JsonProperty("name") String name) {
         this.name = name;
     }
 
+    /**
+     * Creates a new Application instance setting the name and client id properties.
+     *
+     * @param name of the application.
+     * @param clientId the client id of the application.
+     */
+    public Client(String name, String clientId) {
+        this.name = name;
+        this.clientId = clientId;
+    }
+
     /**
      * Getter for the name of the application.
      *

src/test/java/com/auth0/json/mgmt/client/ClientTest.java

@@ -377,4 +377,18 @@ public void shouldIncludeReadOnlyValuesOnDeserialize() throws Exception {
         assertThat(client.isHerokuApp(), is(true));
         assertThat(client.getSigningKeys(), is(notNullValue()));
     }
+
+    @Test
+    public void shouldCreateClientWithNameOnly() {
+        Client client = new Client("My App");
+        assertThat(client.getName(), is("My App"));
+        assertThat(client.getClientId(), is(nullValue()));
+    }
+
+    @Test
+    public void shouldCreateClientWithNameAndClientId() {
+        Client client = new Client("My App", "client123");
+        assertThat(client.getName(), is("My App"));
+        assertThat(client.getClientId(), is("client123"));
+    }
 }