DefaultPipeWriter and DefaultPipeReader should suport (short token)

[davidfowl]

The token can be used to block concurrent reads and writes using the token (as we as other general misuse). We should update the Pipe to support this.

[stephentoub]

While this won't catch every misuse, it's proven to be really helpful in flagging most in APIs that take advantage of it, e.g. Channels, async enumerables (which get it via ManualResetValueTaskSourceCore that uses it), HttpClient's HTTP2 implementation, etc. I agree we should update Pipe to utilize it.

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