[STT] Add support for OpenAI's whisper

[TristanWasTaken]

Add support for OpenAI's Whisper.

Detailed Description

OpenAI published their own STT engine, whisper, some time ago, with quite recently publishing a larger 10GB model file with 1550 M parameters. Whisper currently supports 57 languages.

Context

I'm using Whisper for personal projects.

Possible Implementation

A new STT plugin.

[aaronchantrill]

How are you using Whisper in your own projects? We usually need to be able to customize the dictionary somewhat, usually because of people, place, album, song, etc. names that do not appear in the default dictionary. Do you have any experience with that?

Thanks!