Make global `jest` command line tool like webpack?

[sophiebits]

webpack can be installed globally, but it delegates to a locally-installed version if one exists:

https://github.com/webpack/webpack/blob/7e08847df59f9bed1854ce660946b285055c73d6/bin/webpack.js#L8-L14

Perhaps we should consider the same so that people can use the jest command easily instead of npm test.

[sophiebits]

We could also do the grunt-cli approach, which is more explicit but perhaps feels less clean:

https://github.com/gruntjs/grunt-cli/blob/master/bin/grunt

[jeffmo]

I really like this idea -- hacking on it now

[jeffmo]

39356eb

[github-actions]

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