[Feature] Add ability to read .ds2 files

[allluke]

Description of the feature you are requesting:
As a user, I'd like to be able to have whishper transcribe from a .ds2 file.

Describe the solution you'd like
Click on New Transcription and add a file with extension .ds2 and it transcribes it.

Describe alternatives you've considered
I've only found one software that can convert from .ds2 to other formats so currently I am converting then transcribing using it.
https://www.nch.com.au/components/switchsetup.exe

Additional context
NIL