Make ChunkedMessageBody be a facade over the Connection Pipe and remove the RequestPipe

[jkotalik]

#7603 will keep a request pipe when doing chunked request reading. This CAN be removed, but was too large/out of scope to be in the same PR.

[davidfowl]

This is one we should do but before we do it, we should write some performance tests. I'm guessing chunked reads aren't great but I could be wrong. Another alternative here might be to reuse pipe implementations since these ones are short lived.

[ghost]

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We're moving this issue to the Next sprint planning milestone for future evaluation / consideration. Because it's not immediately obvious that this is a bug in our framework, we would like to keep this around to collect more feedback, which can later help us determine the impact of it. We will re-evaluate this issue, during our next planning meeting(s).
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[ghost]

We've moved this issue to the Backlog milestone. This means that it is not going to be worked on for the coming release. We will reassess the backlog following the current release and consider this item at that time. To learn more about our issue management process and to have better expectation regarding different types of issues you can read our Triage Process.