revert[orm]: export MongoDatabase method

orm/src/main/java/com/zfoo/orm/manager/IOrmManager.java

@@ -38,7 +38,6 @@ public interface IOrmManager {
      * CN:获取MongoClient，通过MongoClient可以获取到其它数据库或者做一些其它的复杂操作
      */
     MongoClient mongoClient();
-    MongoDatabase mongoDatabase();
 
     <E extends IEntity<?>> IEntityCache<?, E> getEntityCaches(Class<E> clazz);
 

orm/src/main/java/com/zfoo/orm/manager/OrmManager.java

@@ -231,11 +231,6 @@ public class OrmManager implements IOrmManager {
         return mongoClient;
     }
 
-    @Override
-    public MongoDatabase mongoDatabase() {
-        return mongodbDatabase;
-    }
-
     @Override
     public <E extends IEntity<?>> IEntityCache<?, E> getEntityCaches(Class<E> clazz) {
         var usable = allEntityCachesUsableMap.get(clazz);