Feature Request: automatically implement marker trait to identify all variants of an enum

[enderprism]

#[derive(EnumVariantType)]
enum MyEnum {
    A,
    B,
    C,
}

would generate a marker trait like such:

trait MyEnumVariant: Into<MyEnum> + TryFrom<MyEnum> {}

and implement it on each variant's generated struct.
It could have additional supertraits according to #[evt(derive)] on the enum.