Add relation between country and subdivision

[codecov[bot]]

Codecov Report

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

Project coverage is 100.00%. Comparing base (80785fe) to head (87b075e).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #236 +/- ## ============================================= Coverage 100.00% 100.00% - Complexity 263 268 +5 ============================================= Files 41 42 +1 Lines 4175 9633 +5458 ============================================= + Hits 4175 9633 +5458 ```

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