Mangrove-reviews-typescript

This is a port of mangrove-reviews, but which uses jose instead of jsonwebtoken. The latter has a dependency which uses Stream, which vite cannot handle.

Another benefit is that this one has better typing* and should thus be more ergonomic to use.

(*): typing is incomplete and only includes the very basic usecase of downloading and uploading reviews - the bare minimum of what I needed for MapComplete. However, I'll gladly merge pull requests which add more types.