[Feature]: CSV Importer add missing categories

[carkom]

We need to add an option (with checkbox) in the csv importer modal for adding missing categories. We've recently added the ability to import categories from the importer but it only uses existing categories.

[MatissJanis]

Not really maintenance or bug task. Converting to a feature.

[github-actions]

✨ Thanks for sharing your idea! ✨

This repository uses lodash style issue management for enhancements. That means enhancement issues are automatically closed. This doesn’t mean we don’t accept feature requests, though! We will consider implementing ones that receive many upvotes, and we welcome contributions for any feature requests marked as needing votes (just post a comment first so we can help you make a successful contribution).

The enhancement backlog can be found here: https://github.com/actualbudget/actual/issues?q=label%3A%22needs+votes%22+sort%3Areactions-%2B1-desc+

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