[Feature][LDAP] Add LDAP authentication login and LDAP group authorization support. (#6333)

* [Feature][LDAP] Add LDAP authentication login and LDAP group authorization support.

* Update docs/.vuepress/sidebar/en.js

Co-authored-by: Mingyu Chen <morningman.cmy@gmail.com>

Co-authored-by: Mingyu Chen <morningman.cmy@gmail.com>

docs/en/sql-reference/sql-statements/Administration/SET LDAP_ADMIN_PASSWORD.md

@@ -0,0 +1,45 @@
+---
+{
+    "title": "SET LDAP_ADMIN_PASSWORD",
+    "language": "en"
+}
+---
+
+<!-- 
+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.
+-->
+
+# SET LDAP_ADMIN_PASSWORD
+## description
+
+Syntax:
+
+    SET LDAP_ADMIN_PASSWORD = 'plain password'
+
+    The SET command is used to set the LDAP administrator password. When using LDAP authentication, doris needs to use the administrator account and password to query the LDAP service for information about the logging user.
+
+## example
+
+1. Set LDAP admin password:
+```
+SET LDAP_ADMIN_PASSWORD = '123456'
+```
+
+## keyword
+    SET, LDAP, LDAP_ADMIN_PASSWORD
+