Chore: export at definition & export for enums

[AH-dark]

I call this project as a dependency in TypeScript, and when I want to change the color, I find that I need to pass in an enum type value. I tried using instance of for type safety, but it seems that the ChatboxColors enum has no export, so I can't import it.

[baptistejamin]

Thank you very much for all those changes. If you want some Crisp merch as a reward, ping me at baptiste@crisp.chat :)