[swift-evolution] Proposal for generic protocols

[Tal Atlas]

With the awesome expansion of protocol oriented programming that swift has
allowed, the lack of generic protocols has felt noticeably lacking and
painful in some cases. I made an in depth proposal here:
https://github.com/tal/swift-evolution/blob/tal/generic-protocol-proposal/proposals/NNNN-add-generic-protocols.md

But the tl;dr is this:

protocol Validator<TypeToValidate> {
  var value: TypeToValidate { get set }
  var valueIfValid: TypeToValidate? { get }
}

struct FooStringValidator: Validator<String> {
  //... implementation
}

let stringValidator: Validator<String>

Look forward to hearing some feedback.
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