feat: Add FSR 2.0 scaling filter option

- Add FSR2 to ScalingFilter enum alongside existing FSR
- Implement FSR2 classes for both Vulkan and OpenGL renderers
- Add fsr2_quality_mode setting with 4 quality levels (Quality, Balanced, Performance, Ultra Performance)
- Integrate FSR2 into present pipeline for both renderers
- Add UI support for FSR2 option in scaling filter dropdown
- Add FSR2 quality mode setting with dropdown selection
- Update translations and Android strings for new options
- Default to Performance mode for optimal balance

This provides users with FSR 2.0 as a scaling option, offering different
quality/performance characteristics compared to FSR 1.0. The implementation
uses quality-based sharpening values and integrates seamlessly with the
existing rendering pipeline.

Signed-off-by: Zephyron <zephyron@citron-emu.org>

src/common/settings.h

@@ -348,6 +348,16 @@ struct Values {
                                                        true,
                                                        true};
 
+    SwitchableSetting<int, true> fsr2_quality_mode{linkage,
+                                                   2,  // Performance by default
+                                                   0,  // Quality
+                                                   3,  // Ultra Performance
+                                                   "fsr2_quality_mode",
+                                                   Category::Renderer,
+                                                   Specialization::Default,
+                                                   true,
+                                                   true};
+
     SwitchableSetting<u8, false> bg_red{
         linkage, 0, "bg_red", Category::Renderer, Specialization::Default, true, true};
     SwitchableSetting<u8, false> bg_green{