Port `translate-genbank-location` to `augur curate parse-genbank-location` [#1485]

[genehack]

Description of proposed changes

This ports translate-genbank-location from nextstrain/ingest to the augur curate sub-command parse-genbank-location.

It adds a command-line flag for providing the field name the location data is stored in; this flag defaults to geo_loc_name to support NCBI's recent change. I provided this to enable the command to also parse older data with the country field name.

Also adds type-hints and tests.

Related issue(s)

• 1485

• https://github.com/nextstrain/ingest/issues/43

Checklist

• [ ] Checks pass
• [x] If making user-facing changes, add a message in CHANGES.md summarizing the changes in this PR

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 69.53%. Comparing base (f6ee377) to head (ee3be71).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1508 +/- ## ========================================== + Coverage 69.40% 69.53% +0.12% ========================================== Files 72 73 +1 Lines 7755 7788 +33 Branches 1900 1905 +5 ========================================== + Hits 5382 5415 +33 Misses 2087 2087 Partials 286 286 ```

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[genehack]

The one failing test is expected.