[Feature] Add option to generate/scrub waveforms along side videos

[BonerFide]

Is your feature request related to a problem? Please describe. Longer videos can be difficult to find periods of activity or dialogue in.

Describe the solution you'd like Displaying a waveform similar to how funscripts/interactive videos are displayed allows active sections / dialogue sections of video to be identified quickly.

Additional context FFMPEG can be used to generate waveform images https://trac.ffmpeg.org/wiki/Waveform

[discourse-stashapp]

This issue has been mentioned on Stash. There might be relevant details there:

https://discourse.stashapp.cc/t/audio-waveform-for-scenes/4662/2