Draft: Added offline exports REST API endpoint to start offline transfer export

Sam Wordrequested to merge
576099-offline-transfer-api-start-export into master

What does this MR do and why?

Added POST /offline_exports to initiate an offline transfer export.

References

How to set up and validate locally

  1. Enable offline_transfer_exports for your current user
  2. Setup an object storage bucket in AWS S3 or a MinIO instance. Using the instance configured with GDK will work fine as long as the instance's region is set. AWS S3 buckets can be configured using Sandbox Cloud.
  3. Call POST /offline_exports
  4. Verify that a new Import::Offline::Export has been created

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Related to #576099

Edited by Sam Word

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