feat: add geo subdivision mocking

[JWhist]

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Summary

Expands upon the geo country mocking, by adding two libraries, a country file and a subdivision file, mapping codes to names and allowing users to mock subdivisions (states/provinces, etc) as well as countries.

Draft PR, have a few glitchy tests and some issues with importing a json file (eslint doesn't like it?)

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[github-actions]

📊 Benchmark results

Comparing with 09009f0

Package size: 223 MB

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• T (current commit): 223 MB

[tinfoil-knight]

Relevant issue: #4498