[Feature request]: Implement system clipboard

[claws99]

Is your feature request related to a problem? Please describe

currently an image (or svg) can't be pasted (using ctrl+v) from system's clipboard.
If I copied an image or svg from the web or external vectorgraphics editor.
I should be able to paste it into this app.

Describe your feature request!

Implement system clipboard.

This could also be used to
move images/svgs from one page to another page or from one notebook to another notebook in this app.

Additional context

No response

Code of Conduct

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

[CodeDoctorDE]

currently the flutter clipboard class only support text: https://api.flutter.dev/flutter/services/ClipboardData-class.html but I found some libs implementing this:

• https://pub.dev/packages/super_clipboard

Otherwise this is the issue on the flutter repo: flutter/flutter#23603

[CodeDoctorDE]

For implementation see #446

[CodeDoctorDE]

Implemented in 2.0.0-beta.5