Add get role controller. Optimize code.

src/main/kotlin/top/fatweb/api/service/permission/IGroupService.kt

@@ -1,7 +1,9 @@
 package top.fatweb.api.service.permission
 
+import com.baomidou.mybatisplus.core.metadata.IPage
 import com.baomidou.mybatisplus.extension.service.IService
 import top.fatweb.api.entity.permission.Group
+import top.fatweb.api.param.authentication.GroupGetParam
 
 /**
  * <p>
@@ -11,4 +13,6 @@ import top.fatweb.api.entity.permission.Group
  * @author FatttSnake
  * @since 2023-10-25
  */
-interface IGroupService : IService<Group>
+interface IGroupService : IService<Group> {
+    fun getPage(groupGetParam: GroupGetParam?): IPage<Group>
+}