Add support for alpha to coverage dithering (#3069)

* Add support for alpha to coverage dithering

* Shader cache version bump

* Fix wrong alpha register

* Ensure support buffer is cleared

* New shader specialization based approach

Ryujinx.Graphics.GAL/IPipeline.cs

@@ -60,6 +60,8 @@ namespace Ryujinx.Graphics.GAL
 
         void SetLogicOpState(bool enable, LogicalOp op);
 
+        void SetMultisampleState(MultisampleDescriptor multisample);
+
         void SetPatchParameters(int vertices, ReadOnlySpan<float> defaultOuterLevel, ReadOnlySpan<float> defaultInnerLevel);
         void SetPointParameters(float size, bool isProgramPointSize, bool enablePointSprite, Origin origin);