Allow .extract/.exclude for nativeEnums

[didinele]

Hey there! We're swapping to zod in our library for validation and we have the following use case:

// some-dependency
enum Something {
  X,
  Y,
  Z
}

We're using this numeric enum from our dependency (which has more like 14 available members), and we happen to want, say, 6 of them as allowed values to a record field.

My instinct was to use z.nativeEnum(Something).extract(...), but I was surprised to learn it doesn't exist. My next idea was to do what I thought was the next most-correct thing, which is z.enum([Something.X, Something.Y, ...]), but I was quickly reminded it only supports strings (fair).

Which leaves me with using literals. #2686 (comment) would be of big help already, since I ended up having to do something like this: https://github.com/discordjs/discord.js/blob/6d44a77180fc52e6b87278b8054c54cb3a501600/packages/builders/src/interactions/slashCommands/Assertions.ts#L61-L75

I think ultimately though, it'd be ideal if "native enums" supported extract & exclude. I'd be willing to try to implement this, just figured I'd make an issue first in case there's a clear-cut sort of blocker for something like this.