chore: Use "exports" condition in package.json

[deanpapastrat]

Per the vite-plugin-svelte docs, all Svelte libraries should use the exports option in package.json instead of svelte, which is deprecated and will be removed soon.

Warning message from Svelte that showed this issue:

[pablo-abc]

Closing since I got another PR that includes the "types" in the exports property. Thanks for the contribution, though! Really appreciate it