[FEATURE] bin: don't JSON.stringify by default when return value isn't an object

[isaacs]

What / Why

It's annoying to have to pass --no-json if you are doing something like:

curl $(pacote resolve pkgname) | tar tv

There's no need to automatically JSON.stringify on non-tty output unless it's an object. The more expected pattern is to just pass strings on through as-is.

Instead of defaulting --json to !process.stdout.isTTY, leave it as undefined, and only console.log json if it's set explicitly to true, or set to undefined and stdout is not a TTY and the result is an object.

[HERBOD7]

@isaacs I can do it.

[isaacs]

Sorry, I got too frustrated by having to strip the " off of strings in the output when debugging stuff. Couldn't wait any longer.