Add use client directives

[dwjohnston]

Adds use client directives so this can be used with nextjs

Note that I ran into this weird issue - where you need to add a "use client" to the exports.ts

https://stackoverflow.com/questions/75261466/unsupported-server-component-type-undefined-next-js-13

For now I'll make do with that solution - but some point in the future we'll want to allow this package to also export RSCs