Add new metadata facets to published schemas
Add new metadata facets to published schemas

This adds the orgs, updated at, and document type metadata to
each search result, to match the metadata shown on current
policy document lits, eg, https://www.gov.uk/government/policies/fulfilling-the-commitments-of-the-armed-forces-covenant/activity

- Content schemas examples updated: https://github.com/alphagov/govuk-content-schemas/pull/55
- Finder frontend support for new metadata: https://github.com/alphagov/finder-frontend/pull/191

alphagov/policy-publisher,alphagov/policy-publisher,alphagov/policy-publisher,alphagov/policy-publisher