Refactor function to read DeepVariantDatasetConfig proto into a separate function that doesn't also instantiate a slim DeepVariantDataSet.
Refactor function to read DeepVariantDatasetConfig proto into a separate function that doesn't also instantiate a slim DeepVariantDataSet.

PiperOrigin-RevId: 186027043

google/deepvariant,google/deepvariant,google/deepvariant