Re: [streams] Add an example of piping to a writable stream for consuming a readable stream (#393)

@wenbozhu in general with new web APIs we try to follow the [extensible web manifesto](https://extensiblewebmanifesto.org/). Instead of only exposing high-level features, we also expose the low-level building blocks that allow you to make higher-level features. That way if someone wants to e.g. implement their own piping algorithm, with different tradeoffs or features, they can do so on top of the primitives, instead of simply being stuck until they convince spec writers/implementers to support their use case.

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