Add multivalued? column to Soil-NMDC-Template_Compiled

[turbomam]

Soil-NMDC-Template_Compiled should have a multivalued column, to indicate whether multiple values are allowed in a DH template based on Soil-NMDC-Template_Compiled.

We could trust MIxS and NMDC's multivalued annotations, but we don't currently have anything analogous for EMSL or JGI fields.

[turbomam]

For multi-values columns following an enumeration, DH will paste the values together with some delimiter. For columns that require typing in a response, we should instruct the user to separate multiple values with the same delimiter.

@turbomam responsible for looking up that DH delimiter.