Adding of customer labels/tags and Notes

### Please check before submitting an issue

- [X] I am using the latest version of App Manager
- [X] I have searched the issues and haven't found anything relevant
- [X] I have read the docs

### Describe a description of the new feature

What I am missing is a way to add personal tags/labels which i can add to the filter. They should be backupable and sould be shown on exported lists.
Background: If you have a big amount of different apps, it might be handy to sort them by topics. E.g. list all games, list all calculator apps, etc.
Additionally adding labels/tags allows to give a personal rating - eg. if you want to recommend your most favorite apps to a friend.

And if possible - a notes field could be also handy :-)

### Describe the solution you'd like

- Adding an input field with dropdown of already defined tags/labels
- Add the info to internal database
- add tags-field to export
- let filters accept tags

The tags should be backupable - so you could import the backup on a new phone and install your tagged apps first (and you could have additional infos like "app needs configuration" or "appdata not backupped via google", if you addded the info on the old phone

### Describe alternatives you've considered

Did not find any app providing something like that... But - at least for me - such function would be VERY handy :-)

### Additional context

Thanks a lot :-)