Toggle component multi event listening support

[Jonas Jabari]

I want to be able to listen to multiple events when using the toggle component like:

toggle show_on: "foo, bar, baz" do
  plain "hey!"
end

[Aaron Contreras]

@jonasjabari This is already part of the toggle component's feature-set. However, I'm using this issue to track some refactoring opportunities that the internals might benefit from for code-clarity and better spec documentation.