Improve accuracy of distance query for Geo3DPoint [LUCENE-8577]

The distance query for Geo3DPoint currently uses the GeoStandardCircle which is only accurate when the PlanetModel is a sphere.

In #9019. a new implementation called GeoExactCircle was added that models an exact circle, even when the planet model is not a sphere. Because Geo3DPoint is using WGS84 planet model, we should be using this implementation instead. The downside is that this implementation will be slightly slower.

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Migrated from [LUCENE-8577](https://issues.apache.org/jira/browse/LUCENE-8577) by Ignacio Vera (@iverase)

Start by locating the Geo3DPoint distance-query code and compare its use of GeoStandardCircle with the GeoExactCircle implementation introduced in #9019. Confirm the behavior for the WGS84 PlanetModel and verify that the query uses the exact-circle behavior, including any relevant existing tests or accuracy checks.

Written by the indexing model from the issue text.