Re-evaluate benefit project_role field vs specific fields for specific roles in ProjectInfo schema

[clevinson]

Currently in the ProjectInfo schema we have separate fields / slots for each role:

• project_developer
• project_verifier
• project_monitor

And for Terrasos we additionally have:

• project_owner
• project_operator

Rather than supporting each of these with a different field, we could instead have a single project_roles slot (multivalued) where the values each had an Enum field which detailed which role the given individual or organization was being assigned to.

This was something @S4mmyb brought up during our recent Framework WG call, but we should speak w/ the rest of the dev team to get input as we may need to refactor our existing anchored project metadata documents.