nearSphere method
Only support geometry of point
Implementation
SelectorBuilder nearSphere(String fieldName, Geometry point,
{double? maxDistance, double? minDistance}) {
_addExpression(fieldName, {
'\$nearSphere': <String, dynamic>{
if (minDistance != null) '\$minDistance': minDistance,
if (maxDistance != null) '\$maxDistance': maxDistance
}..addAll(point.build()),
});
return this;
}