Consider adding spec tests for System.IO.Pipelines

[jkotalik]

In AspNetCore 3.0, we will be exposing Pipes directly across our stack as part of the HttpContext. To do this, we need to create a Stream to Pipe adapter (Pipe that wraps a Stream). It would be nice to have spec tests for System.IO.Pipelines such that our adapted implementation is compliant.

cc @pakrym @davidfowl

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