VideoCommon: add support to graphics mod manager to load in assets and pass it to graphics actions

Source/Core/VideoCommon/GraphicsModSystem/Config/GraphicsModAsset.h

@@ -0,0 +1,18 @@
+// Copyright 2023 Dolphin Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include <string>
+
+#include <picojson.h>
+
+#include "VideoCommon/Assets/DirectFilesystemAssetLibrary.h"
+
+struct GraphicsModAssetConfig
+{
+  std::string m_name;
+  VideoCommon::DirectFilesystemAssetLibrary::AssetMap m_map;
+
+  bool DeserializeFromConfig(const picojson::object& obj);
+};