(feat) add experimental $$Events and strictEvents support #1054
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$$Events lets the user define all events that a component can dispatch. If createEventDispatcher is not typed, the $$Events definition is added to it under the hood for type checking.
strictEvents can be used when the user is sure that there are no other events besides the one from createEventDispatcher and forwarded events - this removes the custom event fallback typing.
#442
#424
sveltejs/rfcs#38