Allow turbowatch to load its configuration from a package#51

## Desired Behavior ```sh turbowatch @myorg/turbowatch-config ``` It would be nice to just tell `turbowatch` to expect the default export of a package to be a config, or a function returning a promise of a config, and use that. ## Motivation I managed to make a pretty cool config that I'm gonna take with me with every single project I have. That means I will have the same file in all of them: ```js import { turbowatchLocalNodeModules } from '@alexaegis/turbowatch'; import { watch } from 'turbowatch'; void (async () => { await watch( await turbowatchLocalNodeModules({ buildDependenciesScript: 'build:dependencies', devScript: 'dev_', }), ); })(); ``` > Had to use an IIFE because top level awaits don't work currently with `turbowatch` It would nice to not have to copy the same thing everywhere and just have the package installed. This could be blocked by https://github.com/gajus/turbowatch/issues/16 if I can't import anything from `turbowatch`, or could be worked around if you export just the type of the configuration. (Currently I have extract it like this `Parameters<typeof import('turbowatch').watch>[0]`) This is really is just a nice-to-have, especially for me because I already have another project that automatically copies this file everywhere it's used.