feat: Whisper speech-to-text

[ghgoodreau]

Is your feature request related to a problem? Please describe.
It would be helpful to add whisper support to allow users to transcribe their speech to text, as some users may prefer this option.

Describe the solution you'd like
A microphone button (and maybe a keybind) that will allow users to utilize speech-to-text when prompting LLMs. Still researching different ways to accomplish this but it should be relatively straightforward to implement.

Describe alternatives you've considered
Whisper makes the most sense because you can use the same API key. Other options can be researched later, possibly when adding #71 support.

Additional context
You can go ahead and assign this to me @transmissions11 just opening it for tracking purposes. I'll also open a draft PR once I start coding so it's visible early on.

[nmandal]

I would like to help contribute! I can take this one if you'd like.