Helper functions for geo queries

[Joannis]

Currently the syntax for Geo queries is very raw and ported from MongoDB. This is fine for MongoDB devs and advanced operations but doesn't feel a part of swift.

A syntax similar to the below would need to be implemented for geo queries:

let nearbyUsers = try db["users"].findNear(x: -72.844092, y: 42.466234, locationField: "location", within: .kilometers(10))

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