[Feature request]: Conversion with Saber

[Iey4iej3]

Is your feature request related to a problem? Please describe

#440

Describe your feature request!

It seems to me that the structures of Saber (https://github.com/adil192/saber) and Butterfly are very similar. However, I guess that it is too premature to implement such a conversion in a very recent future, since Saber is still at early stage, and the file format has not been stabilized: recently, Saber moves from JSON to BSON.

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[CodeDoctorDE]

https://github.com/adil192/saber/blob/main/lib/data/editor/editor_core_info.dart
this is the file structure class.
If anyone wants to work on that feel free to make a pr.
But I would wait until this format is stable

[mounicakasturi]

Could be added to #440

[CodeDoctorDE]

I already added it there. These issues are on a very low quality but everyone that wants to contribute can work on these