Finalize nested outputs for wide-columned outputs

[andrewallenbruce]

• [ ] nppes_npi()
• [ ] beneficiary_enrollment()
• [ ] provider_enrollment()
• [ ] opt_out()
• [ ] physician_by_service()
• [ ] physician_by_geography()
• [ ] physician_by_provider()
• [ ] open_payments()
• [ ] taxonomy_crosswalk()
• [ ] revalidation_date()
• [ ] revalidation_reassign()
• [ ] revalidation_group()
• [ ] cc_multiple()
• [ ] cc_specific()

No longer think nesting outputs is a good idea, may revisit in the future