This PR Introduces org settings infra and service layer, but doesn't replace existing config usage yet (next PR).

Changes

• Implement org settingsin the organization_settings db table as KV pairs of key: str -> value: bytes to support orjson-serialized JSON data, and data that's encrypted at rest.
• Implement settings service and endpoints.
  • "Settings groups" are a related collection of settings. We expose get/update endpoints for settings groups so that clients interchange over typesafe structs.
  • We don't support CRUD endpoints for individual settings, as there is no valid use case for exposing them in the router.
  • Only internal services may read/update settings, and this should be done directly through the SettingsService layer.

Deprecations

• Mark affected configs as deprecated

Testing

• Add unit tests for org settings