Metainformation for roles

[davydovanton]

It will be really important to setup any meta information to role for abilities list. Now we want to allow developers setup it and in next iteration use it in roles or other places.

What API I see for setup meta information:

module Post
  class AnonymousAbilities
    include Kan::Abilities

    role :anonymous, metainformation: :here, other: :information, Roles::Anonymous.new
    register(:read, :edit, :delete) { false }
  end

  class AdminAbilities
    include Kan::Abilities

    role :admin, weight: 2, version: 1, Roles::Admin.new
    register(:read, :edit, :delete) { |_, _| true }
  end
end