Add get role controller. Optimize code.

src/main/kotlin/top/fatweb/api/param/authentication/GroupGetParam.kt

@@ -0,0 +1,12 @@
+package top.fatweb.api.param.authentication
+
+import io.swagger.v3.oas.annotations.media.Schema
+import top.fatweb.api.param.PageSortParam
+
+data class GroupGetParam(
+    @Schema(description = "查询用户组名称")
+    val searchName: String? = null,
+
+    @Schema(description = "查询使用正则表达式")
+    val searchRegex: Boolean = false,
+) : PageSortParam()