Add Faster Whisper

[chidiwilliams]

• Add test for transcriber
• Better way to check if the model is already downloaded? Might need to escape the faster-whisper API.

[codecov]

Codecov Report

Merging #400 (5ef0847) into main (b807302) will increase coverage by 0.03%.
The diff coverage is 89.28%.

@@            Coverage Diff             @@
##             main     #400      +/-   ##
==========================================
+ Coverage   76.30%   76.33%   +0.03%     
==========================================
  Files           8        8              
  Lines        1688     1724      +36     
==========================================
+ Hits         1288     1316      +28     
- Misses        400      408       +8     

Flag	Coverage Δ
Linux	76.33% <89.28%> (+0.26%)	⬆️
Windows	?
macOS	?

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Impacted Files	Coverage Δ
buzz/transcriber.py	69.74% <87.75%> (+0.76%)	⬆️
buzz/gui.py	77.40% <100.00%> (-0.39%)	⬇️
buzz/model_loader.py	83.05% <100.00%> (+1.80%)	⬆️

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