[#5987] improvement: Add more configurations for the config API (#5999)

### What changes were proposed in this pull request?

Add more configurations for the config API

### Why are the changes needed?

Fix #5987 
Front end can use this config option to optimize the user experience.

### Does this PR introduce _any_ user-facing change?

No.

### How was this patch tested?


![image](https://github.com/user-attachments/assets/a5f26c61-9e10-4dfa-bbcd-54cb887b1b71)

server/src/main/java/org/apache/gravitino/server/web/ConfigServlet.java

@@ -42,22 +42,20 @@ public class ConfigServlet extends HttpServlet {
       ImmutableSet.of(OAuthConfig.DEFAULT_SERVER_URI, OAuthConfig.DEFAULT_TOKEN_PATH);
 
   private static final ImmutableSet<ConfigEntry<?>> basicConfigEntries =
-      ImmutableSet.of(Configs.AUTHENTICATORS);
+      ImmutableSet.of(Configs.AUTHENTICATORS, Configs.ENABLE_AUTHORIZATION);
 
-  private final Map<String, String> configs = Maps.newHashMap();
+  private final Map<String, Object> configs = Maps.newHashMap();
 
   public ConfigServlet(ServerConfig serverConfig) {
     for (ConfigEntry<?> key : basicConfigEntries) {
-      String config = String.valueOf(serverConfig.get(key));
-      configs.put(key.getKey(), config);
+      configs.put(key.getKey(), serverConfig.get(key));
     }
 
     if (serverConfig
         .get(Configs.AUTHENTICATORS)
         .contains(AuthenticatorType.OAUTH.name().toLowerCase())) {
       for (ConfigEntry<?> key : oauthConfigEntries) {
-        String config = String.valueOf(serverConfig.get(key));
-        configs.put(key.getKey(), config);
+        configs.put(key.getKey(), serverConfig.get(key));
       }
     }
   }

server/src/test/java/org/apache/gravitino/server/web/TestConfigServlet.java

@@ -0,0 +1,46 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *  http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.apache.gravitino.server.web;
+
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+import java.io.PrintWriter;
+import javax.servlet.http.HttpServletResponse;
+import org.apache.gravitino.server.ServerConfig;
+import org.junit.jupiter.api.Test;
+
+public class TestConfigServlet {
+
+  @Test
+  public void testConfigServlet() throws Exception {
+    ServerConfig serverConfig = new ServerConfig();
+    ConfigServlet configServlet = new ConfigServlet(serverConfig);
+    configServlet.init();
+    HttpServletResponse res = mock(HttpServletResponse.class);
+    PrintWriter writer = mock(PrintWriter.class);
+    when(res.getWriter()).thenReturn(writer);
+    configServlet.doGet(null, res);
+    verify(writer)
+        .write(
+            "{\"gravitino.authorization.enable\":false,\"gravitino.authenticators\":[\"simple\"]}");
+    configServlet.destroy();
+  }
+}

web/web/src/lib/store/auth/index.js

@@ -40,7 +40,7 @@ export const getAuthConfigs = createAsyncThunk('auth/getAuthConfigs', async () =
   oauthUrl = `${res['gravitino.authenticator.oauth.serverUri']}${res['gravitino.authenticator.oauth.tokenPath']}`
 
   // ** get the first authenticator from the response. response example: "[simple, oauth]"
-  authType = res['gravitino.authenticators'].slice(1, -1).split(',')[0].trim()
+  authType = res['gravitino.authenticators'][0].trim()
 
   localStorage.setItem('oauthUrl', oauthUrl)