This adds a new configurable feature to restrict event publishing to
only users with NIP-05 verified metadata. Domains can be whitelisted
or blacklisted. Verification expiration and schedules are
configurable.
This upgrades the database to add a table for tracking verification
records.
Change descr to description. Add `id` for websocket URL. Use
integers for supported NIPs instead of strings. Top-level is object,
instead of the array before.
