[FEAT]: Add support for watchlist

[jylin]

Description

• Add support for getting a user's watchlist: https://trakt.docs.apiary.io/#reference/sync/get-watchlist
• Add the Lists as an export to client.ts

Additional Information

No response

[Huskydog9988]

Getting watchlist support is up there, I forget why I never implemented it, so hopefully it shouldn't be too bad. As for export Lists, what do you mean by that? I assume its a type but I'm unsure of what its from.

[jylin]

It's just not exported here like the older classes:
https://github.com/getaugur/better-trakt/blob/main/src/client.ts#L171

[Huskydog9988]

ooh, the entire namespace is missing, i'll do that in a minute