Filing this issue to track the work to make zoneinfo64 usable by temporal_rs.

temporal_rs does all timezone computation through one trait, [TimeZoneProvider]. It does normalization and canonicalization, which is out of scope for zoneinfo64, but the rest is important here.

It has three main endpoints:

• get_named_tz_epoch_nanoseconds: getting the potential epoch nanoseconds corresponding to a local datetime in a given timezone (this can have multiple results if it's during a transition)
• get_named_tz_offset_nanoseconds: getting the offset for a given epoch nanoseconds value.
• get_named_tz_transition: getting the next/previous timezone transition from a given epoch nanoseconds, if any

(These APIs likely should be renamed, but they are what they are right now)