Limit step length in user provided field

We should provide the ability to limit the step length for traversal of a user provided field map. This would ideally only be applied to the volumes the field is applied to for efficiency. This would allow the user to force smaller integration steps when the field is known to vary on a certain length scale with space.

In Geant4, only a minimum step size can be set in the field / integrator side of things. To limit the maximum step length, one must construct a set of user limits and attach them to a logical volume. Fields are also attached to logical volumes and not physical volumes so this shouldn't be a problem.

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