CaloGeoHelpers: A few additions to CaloSampling.
Add CaloSampling::getSampling to convert from a name to a sampling. Make getNumberOfSamplings() constexpr. Add a unit test for CaloSampling.
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Add CaloSampling::getSampling to convert from a name to a sampling. Make getNumberOfSamplings() constexpr. Add a unit test for CaloSampling.