Fix compilation of individual packages

[Luk-ESC]

Previously pumpkin-text, pumpkin-protocol and pumpkin-world would not compile on their own.
This happened because we didn't specify the required features, but since a dependency (or pumpkin) enabled them, the error went unnoticed.
Check out https://doc.rust-lang.org/cargo/reference/features.html#feature-unification for more information.

This PR enables the sync feature for tokio which is required by pumpkin-world and moves uuid to the workspace so that every crate uses the same feature set (specifically, pumpkin-text and pumpkin-protocol also require it's serde feature).

[Snowiiii]

Hey, Your right and i have nothing to add. Thanks for the PR @Luk-ESC 👍