Python: Add function to compute distance to closest fault based on point

[magnesj]

Input parameter is XYZ point. Based on this point, compute the closest fault face, and return the distance and the fault face direction.

[kriben]

See RigStimPlanModelTools::findClosestFaultBarrier for potential building block: need to shoot rays in multiple directions.

[kriben]

RigFaultDistanceResultCalculator::calculate is also relevant.