Importing issues with new labels should have them automatically created

Problem to solve

When importing a CSV of issues it's possible to include the /label ~bug list, however, if the labels don't already exist then they are skipped. It would be great if these new labels were automatically created, similar to how the API treats new labels when creating issues.

Intended users

User experience goal

The user should be able to upload issues via a CSV file and have new labels created automatically.