add new struct definitions

Il2CppInspector.Common/Next/BinaryMetadata/Il2CppGenericInst.cs

@@ -0,0 +1,14 @@
+using VersionedSerialization.Attributes;
+
+namespace Il2CppInspector.Next.BinaryMetadata;
+
+[VersionedStruct]
+public partial struct Il2CppGenericInst
+{
+    public readonly bool Valid => TypeArgc > 0;
+
+    [Aligned(0)]
+    public uint TypeArgc;
+
+    public Pointer<Pointer<Il2CppType>> TypeArgv;
+}