feat: 添加屏幕去重功能并调整测试用例目录结构

src/backend/output_utils.h

@@ -0,0 +1,9 @@
+#pragma once
+
+#include <stddef.h>
+
+#include "core/backend.h"
+#include "core/wm_desc.h"
+
+wm_backend_detect_t *output_remove_duplication(const wm_output_info_t *output,
+                                               const size_t count);