Refactor recordings retention to be based on review items

[NickM-27]

This PR makes the following changes:

• Refactor recording config to have separate retention configs for alerts and detections
  • It is now possible to define separate recording retentions for alerts and detections, removing the obscurity of the previous implementation
  • Recordings for detections can now be explicitly disabled if desired
• Events are now always saved in the DB for detected objects if they match the alerts or detections definition. This improves searchability of events when semantic search is enabled and will improve the ability to debug review items.
• Automatic config migration for 0.15 recording config

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