rustEnumerationSized<T>  method 
Creates an enum codec for Rust style enums (tuple or struct constructors) for fixed size
data types.
A codec can encode/decode data types to/from byte arrays Iterable<u8> and Buffers.
Implementation
BorshRustEnumSizedCodec<T> rustEnumerationSized<T>(
  final List<BorshCodecFixedSized<T>?> variants,
) => BorshRustEnumSizedCodec(variants);