Recognize and display `init` property accessor

C# now allows the `init` property accessor, in addition to `get` and `set`. In warning messages linker will show getter like `Type.Property.get` and setter like `Type.Property.set`. But it doesn't recognize `init`, it will see it as `set` instead.
Ideally for init accessor it would show `Type.Property.init`.
https://docs.microsoft.com/en-us/dotnet/csharp/language-reference/keywords/init