[issue40536] Addition of a "list of available time zones" function to zoneinfo

[Paul Ganssle]

Paul Ganssle <p.ganssle at gmail.com> added the comment:

I have an initial implementation against the reference implementation here: https://github.com/pganssle/zoneinfo/pull/60

Once GH-19909 is merged, I will turn that into a PR against CPython.

For the first pass I went with:

1. free-standing function
2. returning set()
3. no cache
4. available_timezones()

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