Adding Core ML support for WhisperCpp

[raivisdejus]

This also changes how models for Whisper.cpp are downloaded. After update of the app models will need to be re-downloaded if you have them already downloaded.

[codecov]

Codecov Report

Attention: Patch coverage is 89.50276% with 19 lines in your changes missing coverage. Please review.

Project coverage is 81.33%. Comparing base (ce3bfea) to head (3972d29).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
buzz/transcriber/whisper_cpp.py	87.38%	14 Missing ⚠️
buzz/transcriber/recording_transcriber.py	62.50%	3 Missing ⚠️
buzz/model_loader.py	93.33%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #976      +/-   ##
==========================================
+ Coverage   81.17%   81.33%   +0.15%     
==========================================
  Files          86       86              
  Lines        4893     5019     +126     
==========================================
+ Hits         3972     4082     +110     
- Misses        921      937      +16     

Flag	Coverage Δ
Linux	80.33% <71.82%> (-0.48%)	⬇️
Windows	80.41% <70.19%> (-0.47%)	⬇️
macOS	81.15% <89.50%> (+0.15%)	⬆️

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