expand value set command should allow for configurable materialized values

[cmungall]

Current the tool assumes you want to refer to a materialized enum PV by its curie; in fact this may vary, others may want

• expanded URLs
• labels
  • with or without space replacement to camelcase/uppercase etc
• ad-hoc schemes such as MIxS combine harvester [AGRO:00000473]
• others

We can't anticipate all forms but we can allow passing in of an fstring (I don't think this should be schema-driven), with save evaluation materializing as preferred

[turbomam]

Also applicable to

• update HACCP_term regex to required FOODON, add multivalue example GenomicsStandardsConsortium/mixs#802