[Draft] Increase performance of Session list view

[mihow]

• Pre-calculate and cache captures, detections and occurrences count
• Begin testing new field for calculated_fields_updated_at to track dirty cache
• Begin testing new bulk method for updating objects with out-of-date counts (see update_calculated_fields_for_events)
• Optimize the queries for nested example captures on the sessions list view (one of the slowest parts)
• Reduce number of queries on list view from 250+ to less than 10.
• Bring back sorting by num species per night!

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