Add simple CLI utility

[j-]

Very simple addition. Allows resolve to be installed globally or to be used as part of an npm script.

Example

I want to add eslint and a TAP reporter to my project. My package.json:

Before

{
    "devDependencies": {
        "eslint": "*",
        "eslint-tap": "*"
    },
    "scripts": {
        "test": "eslint . --format node_modules/eslint-tap/tap.js"
    }
}

Bad. No guarantee that formatter will exist at that path.

After

{
    "devDependencies": {
        "resolve": "*",
        "eslint": "*",
        "eslint-tap": "*"
    },
    "scripts": {
        "test": "eslint . --format $(resolve eslint-tap/tap)"
    }
}

Good. Path is not hard coded.

[ljharb]

Please rebase, and check the "allow maintainers to edit" checkbox. Thanks!

[ljharb]

The only thing I think this needs before landing is a way to specify extensions and preserve-symlinks, but I don't want to add an entire arguments parser :-/

[ljharb]

I've added --preserve-symlinks support, -- support, failing on unknown -- arguments, and defaulted it to false to match node itself (I'll keep that behavior when it's backported to v1.x as well).

I'm still thinking about how to handle extensions, but I think that can be done later as semver-minor.