[WIP] Allow for optimistic locking to be turned on post-production. #704
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Data should be persisted in such a way that it's okay if optimistic
locking is turned on later, and shouldn't require a data migration.
This will require a migration for postgres, but will give a warning if
it hasn't been run. Existing data will need to be migrated - maybe delay
this for 3.0?
The postgres migration will be something like:
Valkyrie::Persistence::Postgres::ORM::Resource.where(lock_version: nil).update_all(lock_version: 0)
Maybe we can just put it in the migration for the change default db migration file and that'll be fine?