add new struct definitions

Il2CppInspector.Common/Next/BinaryMetadata/Il2CppGenericMethodIndices.cs

@@ -0,0 +1,16 @@
+using VersionedSerialization.Attributes;
+
+namespace Il2CppInspector.Next.BinaryMetadata;
+
+using MethodIndex = int;
+
+[VersionedStruct]
+public partial struct Il2CppGenericMethodIndices
+{
+    public MethodIndex MethodIndex;
+    public MethodIndex InvokerIndex;
+
+    [VersionCondition(EqualTo = "24.5")]
+    [VersionCondition(GreaterThan = "27.1")]
+    public MethodIndex AdjustorThunkIndex;
+}