Exporting: Support for trigger background exports #720

Quick description

• User tiggers an export for the Occurrences list view based on current filters https://antenna.insectai.org/projects/18/occurrences (an other list views)
• Choose from various formats (CSV, json, sql)
• New model for tracking export history
• Background job for generating export
• Show user links to exports that are ready
• Start with polling the exports endpoint
• Look into websockets & notifications to user
• Consider emailing the user with link

When we have an Occurrence Collection/Dataset type, then the user can create a dataset/collection from the Occurrence filters first, then export the Dataset/collection. So exports could actually be a method on Occurrence Datasets.

Examples of good asynchronous exports with notifications

• GBIF export
• Label Studio