☂️File formats - importing and exporting

[claws99]

Is your feature request related to a problem? Please describe

No response

Describe your feature request!

umbrella issue for importing and exporting various file formats. This helps the app work nice with other notetaking apps

Additional context

No response

Code of Conduct

• [X] I agree to follow this project's Code of Conduct

### Tasks
- [ ] https://github.com/LinwoodDev/Butterfly/issues/314
- [ ] https://github.com/LinwoodDev/Butterfly/issues/427
- [ ] https://github.com/LinwoodDev/Butterfly/issues/484
- [ ] https://github.com/LinwoodDev/Butterfly/issues/791

[CodeDoctorDE]

All migrations are marked as https://github.com/LinwoodDev/Butterfly/labels/good%20first%20issue for people that wants to contribute. You don't need to be familiar with the whole code, only the file format classes inside api. They are not associated with a milestone to give a bit more time for people that wants to help.

Please comment on this issue if you want to start, then I can assign you to this issue