[Feature request] Categorization QOL updates

[kwilcz]

Is your feature request related to a problem? Please describe.
Having over 20 authenticator entries makes the main screen hard to navigate. While categories sound like a great solution, they are currently hard to navigate through and moving entries between them is troublesome.
Having a nicely organized main screens enables quick access to any otp

Describe the solution you'd like
Expandable categories visible on the main screen with drag&drop option to add / remove entry from category. Visibly similar to Windows downloads folder which categorizes by-date.
This might be an additional option for sorting - sort by category.

Additional context
Drag & drop is already implemented as custom sorting option. Might be used with something simmilar to ExpandableListView to work with categories.