Provide decorator for stream consumer through pipe

[tzkmx]

However I strongly feel that original API should be built on top of stream not the event

Originally posted by @amitguptagwl in #166 (comment)

Extending the Stream prototype has been tried but created issues that were reverted at the immediate posterior release.

There are several issues raised around support for Streams, and probably without breaking the current API, we can provide a decorator for request.pipe() that would make easier to integrate with handlers that expect a ReadableStream rather than json or urlencoded body.

[eugef]

I think this is related to #277

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