feat: add memberOf query filter

docs/ldap/ldapserver.md

@@ -42,3 +42,5 @@ Once the bind operation completes successfully, you can perform the search opera
 - To search for a certain user, such as `Alice` under the `built-in` organization, you should use a `DN` like this: `ou=built-in,dc=example,dc=com`, and add `cn=Alice` in the Filter field.
 - To search for all users under a certain organization, such as all users in `built-in`, you should use a `DN` like this: `ou=built-in,dc=example,dc=com`, and add `cn=*` in the Filter field.
 - To search for all users in all organizations (assuming the user has sufficient permissions), you should use a `DN` like this: `ou=*,dc=example,dc=com`, and add `cn=*` in the Filter field.
+- To search for all users based in a specific group, you should use a filter query like this: `(memberOf=organization_name/group_name)` in the Filter field.
+