--emit=dep-info stdout support

[albizures]

I'm working on the integration of wasm and rust into parcel.js, and we want to use --emit=dep-info to watch the dependencies, but we are wondering if it's possible to send the output to the stdout instead of creating a file.

And btw is it doable to have a json output? this could help a bit the parsing of the dependencies from Node.

you can see our progress here

thanks!

[Enselic]

Triage: Closing as fixed by #111626 which added regression tests.