[whatwg/streams] Interface for push based ReadableStream? (#889)

Hi! I'm working on a proxy that needs to give user code a stream interface, but only actually read the underlying data on demand. As far as I can tell, this matches the description [push based data sources](https://github.com/whatwg/streams/blob/master/Requirements.md#you-must-be-able-to-efficiently-adapt-existing-push-based-data-sources-into-a-uniform-streaming-interface).

Is there a standard interface for starting/pausing/resuming push based `ReadableStreams`, or should it be done ad hoc?

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