feat: Import both expense and income from CSV

[RyanLiu6]

Prerequisites

• [X] I have searched for existing issues that already include this feature request, without success.

Describe the Feature Request

When importing from CSV, I'd like to be able to import both expense and income. Currently, when selecting categories, it only allows categories from expenses.

Describe the Use Case

My personal use-case involves processing my credit card statements, which if I have a refund or a price match of sorts, must be manually modified upon import. It'd be nice if upon import, the categories to link can be directly linked to income as well to accurately portray what I actually spent.

Additional Information

No response