Add support for OpenAI Whisper API

[chidiwilliams]

No description provided.

[codecov]

Codecov Report

Merging #371 (089f5f0) into main (3a59172) will decrease coverage by 1.03%.
The diff coverage is 58.13%.

@@            Coverage Diff             @@
##             main     #371      +/-   ##
==========================================
- Coverage   77.65%   76.62%   -1.03%     
==========================================
  Files           7        8       +1     
  Lines        1490     1660     +170     
==========================================
+ Hits         1157     1272     +115     
- Misses        333      388      +55     

Flag	Coverage Δ
Linux	76.38% <58.13%> (?)
Windows	72.67% <58.02%> (-4.98%)	⬇️
macOS	75.48% <58.13%> (?)

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Impacted Files	Coverage Δ
buzz/model_loader.py	81.25% <40.00%> (ø)
buzz/transcriber.py	69.00% <46.93%> (+5.55%)	⬆️
buzz/gui.py	78.31% <78.12%> (-4.74%)	⬇️
buzz/cache.py	88.00% <0.00%> (+8.00%)	⬆️

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