feat: add default method

[Kikobeats]

Hello,

This default method is just to make this library a drop replacement for the original ms – What do you think? 🙂

[lukeed]

I dunno, do people still use original? I'd have figured that these all became comp-time replacements at this point and/or that people really would have hated the "you get a different function based on arity" usage pattern...

If we were to do this, would need to do a bunch more d.ts and "exports" map changes to properly handle the default in ESM vs CJS

[Kikobeats]

According to socket.dev, original is one of the most used package at npm:

Totally up to you, I thought a drop replacement will help this package to have more adoption.