Add Runtime::input_is_pipe()

We need this because we might want to check whether we can get the STDIN
handle from the runtime or not.
In some (rare) cases, the runtime "thinks" that STDIN is a stream of
IDs, but it is not. So the client can check whether stdin is a pipe
(thus, whether Runtime thinks that there's a stream of IDs) and easily
work around that by taking ::std::io::stdin() itself.

Signed-off-by: Matthias Beyer <mail@beyermatthias.de>

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