geoip: add support for the MaxMind country db

[agrawroh]

Description

This PR adds support for MaxMind Country DB in GeoIP filter. Sometimes corporates purchases the paid version of these datasets and they may not have the city database.

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Commit Message: geoip: add support for the MaxMind country db
Additional Description: Adds support for MaxMind Country DB in GeoIP filter.
Risk Level: Low
Testing: Added Unit + Integration Tests
Docs Changes: Added
Release Notes: Added

[repokitteh-read-only]

As a reminder, PRs marked as draft will not be automatically assigned reviewers,
or be handled by maintainer-oncall triage.

Please mark your PR as ready when you want it to be reviewed!

🐱

Caused by: #42419 was opened by agrawroh.

see: more, trace.

[repokitteh-read-only]

CC @envoyproxy/api-shepherds: Your approval is needed for changes made to (api/envoy/|docs/root/api-docs/).
envoyproxy/api-shepherds assignee is @mattklein123
CC @envoyproxy/api-watchers: FYI only for changes made to (api/envoy/|docs/root/api-docs/).

🐱

Caused by: #42419 was opened by agrawroh.

see: more, trace.

[agrawroh]

/retest