refs https://github.com/TryGhost/Ghost/issues/10318
- `group`
- to replace the `type` column, provides a more descriptive name for the columns use
- for existing sites it will be populated by migrating data from the `type` column in a later migration
- for new sites a minimal update has been added to `parseDefaultSettings()` to populate the `group` field when settings are created during startup - fixes the NOT NULL constraint on `settings.group`
- `flags`
- signifies special handling that is different to other settings in a group
- eg, `PUBLIC,RO` would indicate that the setting is available via unauthenticated endpoints and is read-only
4a9e57c170