Qt: Add float config tooltip slider

Source/Core/DolphinQt/Config/ConfigControls/ConfigFloatSlider.h

@@ -0,0 +1,30 @@
+// Copyright 2023 Dolphin Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include "DolphinQt/Config/ToolTipControls/ToolTipSlider.h"
+
+namespace Config
+{
+template <typename T>
+class Info;
+}
+
+// Automatically converts an int slider into a float one.
+// Do not read the int values or ranges directly from it.
+class ConfigFloatSlider : public ToolTipSlider
+{
+  Q_OBJECT
+public:
+  ConfigFloatSlider(float minimum, float maximum, const Config::Info<float>& setting, float step);
+  void Update(int value);
+
+  // Returns the adjusted float value
+  float GetValue() const;
+
+private:
+  float m_minimum;
+  float m_step;
+  const Config::Info<float>& m_setting;
+};