IFC-569: infer hfid from single-attribute uniqueness constraint

[ajtmccarty]

fixes #4174
fixes #4181
IFC-569
IFC-581

IFC-569

update schema processing so that if a schema DOES NOT have a human_friendly_id defined and DOES have a uniqueness_constraint that includes a single attribute, set the human_friendly_id to use that attribute
this is basically what we do if there is no human_friendly_id, but there is an attribute that is set to unique=True

for example

SchemaA:
  uniqueness_constraints: [["name__value"]]
  human_friendly_id: null

would become

SchemaA:
  uniqueness_constraints: [["name__value"]]
  human_friendly_id: ["name__value"]

IFC-581

update schema validation so that a uniqueness constraint that consists of a single attribute can be used to consider an attribute unique when it comes to validating that the human-friendly ID includes a unique attribute