Re: [streams] First draft at tee algorithms, for critique (#302)

@tyoshino 

> I basically think such needs should be taken care of by more complex custom tee-ing code.

I think that is the right approach, especially for now. I do want to decide on a default though---both for other specs to use (like `res.clone()`), and for an author-exposed `.tee()` method. We could allow the author-exposed `.tee()` method to be customizable with a framework like you suggest (which is pretty slick!)... but later. For now let's just decide a default.

Reading your `DefaultCancelPropagator`, it seems you support "Both cancels fulfill" as the default. Hmm.

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