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Support arbitrary length unions (#166)

* feat: support arbitrary length unions

I had to separate out "RuntypeBase" which only includes the actual validation methods from "Runtype" which includes all the helper methods. This is because internally we frequently treat Runtype as "covariant" i.e. if I was expecting a `Runtype<string>` it's ok to give me a `Runtype<'hello world'>`. TypeScript historically hasn't cared that much about variance, but over time it is getting strickter and the helper methods are often invariant.

BREAKING CHANGE: the various `Union2`, `Union3`, ... types have all been replaced with a single `Union` type that takes a tuple of Runtype validators.

Co-authored-by: Yu Shimura <mail@yuhr.org>

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