FidelityFX FSR implementation (#2624)

* host_shaders: support for includes

* video_core: add a simpler vulkan asserts

* video_core: refactored post processing pipeline to another file

* renderer_vulkan: add define param to compile shader utility

* video_core: fsr implementation

* devtools: show resolution & fsr state

src/common/string_literal.h

@@ -0,0 +1,15 @@
+//  SPDX-FileCopyrightText: Copyright 2024 shadPS4 Emulator Project
+//  SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+template <size_t N, typename C = char>
+struct StringLiteral {
+    static constexpr size_t len = N;
+
+    constexpr StringLiteral(const C (&str)[N]) {
+        std::copy_n(str, N, value);
+    }
+
+    C value[N]{};
+};