npm / cli / #3742 / 1

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feat(arborist): refactor arborist bin to use consistent timing/logging

This attempts to make the arborist bin script behave more like the npm
cli with regards to the handing of timing and logging.

It also adds the a `logfile` argument to write logs to a file instead of
(or in addition to) stderr. This can be helpful for benchmarking
performance of loggins or terminal display.

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