List pub cache location: `pub cache show`

[DartBot]

This issue was originally filed by guillermo.l...@gmail.com

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Hi,

At least on Windows, it's hard to see where the cache is located. Could we have an option to list the pub cache location(s)?

Regards,
Guillermo

[dgrove]

Added Area-Pub, Triaged labels.

[nex3]

It always defaults to $APPDATA/Pub/Cache on Windows. I don't think it's worth adding a command to print this out.

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Added NotPlanned label.

[DartBot]

This issue has been moved to dart-lang/pub#1107.