Enable "invocation" of WASI modules via stdio #54
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This PR enables (when supported) that WASI modules to be "called" via stdio.
This means data is appeneded to the WASI process via stdin, where a piped reader is fed with the incoming bytes
[u8], while the data is outputted via stdout, using a writable pipe, returning either aVec<u8>or an error as a result.