Reader: support aborting a read

[mfulton26]

e.g. I want to be able to read bytes on a TCP socket connection and await more bytes for N milliseconds before processing those received bytes.

see also #10181

[stale]

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[mfulton26]

Keep alive

[joe-hx]

Adding support for the request as I would like to be able to abort a read on a piped Deno.Process.stdout.

[HurricanKai]

Another usage example for this would be reading from stdin with cancellation. Useful when asking for user input optionally.