npm / cli / #701

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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.

1992 of 2993 branches covered (66.56%)

Branch coverage included in aggregate %.

30 of 30 new or added lines in 2 files covered. (100.0%)

3771 of 5214 relevant lines covered (72.32%)

13.69 hits per line