Migrate `FsTzdbProvider` to the new provider crate

[nekevss]

With the new provider crate available, FsTzdbProvider should be moved from temporal_rs to timezone_provider.

This may be soft blocked depending on the decisions in #277. As the current, FsTzdbProvider may need to be adjusted to a more limited scope and the resolution logic moved to a separate crate.

[Manishearth]

When this happens it's worth going through depcheck again and ensuring there are no leftover parsing deps.

[nekevss]

Completed in #537