npm / cli / #705 / 1

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Use @npmcli/run-script for exec, explore; add interactive exec

This removes all other arg/shell escaping mechanisms, as they are no
longer needed, and will be un-done by puka in @npmcli/run-script anyway.

Adds an interactive shell mode when `npm exec` is run without any
arguments, allowing users to interactively test out commands in an npm
script environment.  Previously, this would do nothing, and just exit.

Prevent weird behavior from `npm explore ../blah`.  `explore` now can
_only_ be used to explore packages that are actually found in the
relevant `node_modules` folder.

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