PHPORM-221 Convert $near into $geoWithin for count used by pagination

[GromNaN]

Fix PHPORM-221
Fix #3063

The sorting provided by $near is not important for counting, but is useful when getting paginated results. So we can convert the operation to $geoWithin when in an aggregation.

If can try to add other unsupported operators ($geoNear and $nearSphere).

Checklist

• Add tests and ensure they pass
• Add an entry to the CHANGELOG.md file
• Update documentation for new features

[GromNaN]

$minDistance is missing