[Feature Request] Add support for string conversion from enum aliases

[janpfeifer]

Would it make sense to add support for enum aliases ?

Example:

type MyType int

const (
  A MyType = iota
  B
)

const (
  AlsoA = A
  BInSpanish = B
)

And then have a call to MyTypeString("AlsoA") -> A and MyTypeString("BInSpanish") -> B ?

My concrete use case: I'm adding support to various naming schemes for data types (dtype) for machine learning frameworks, see this file, and the community doesn't seem to agree on one naming convention for these things. I was hopping to leverage enumer to handle the conversion from string also for the aliases.

ps.: Btw, thanks for writing and maintaining enumer!