Feature Request: add Opus chapter support

[BBBalls]

Bug/Feature description

It would be nice for Opus chapter support to be added to Cozy.

I have been re-encoding my audiobooks to single files in the Opus format to reduce file management complexity and disk space on my phone and laptop. Having chapter support for Opus would make it easier to manually sync the position in Voice on my Android phone with Cozy on my laptop. Additionally, it would make it easier to start a chapter over after being too busy or spacing out.

System Information

• Operating System: Pop!_OS 22.04
• Installation source: Flatpak
• Version of cozy: 1.3.0

Thanks for making Cozy. It is the best way to listen to audiobooks on Linux.

[rgarber11]

My PR implements this without any additional dependencies.

[winstonma]

I am looking forward to this feature too.