Adding custom model size for Whisper.cpp and Faster Whisper

[raivisdejus]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 63.49206% with 46 lines in your changes missing coverage. Please review.

Project coverage is 82.67%. Comparing base (4d06273) to head (865c316).

Files	Patch %	Lines
buzz/model_loader.py	55.55%	20 Missing ⚠️
...ts/preferences_dialog/models_preferences_widget.py	69.76%	13 Missing ⚠️
buzz/settings/settings.py	58.82%	7 Missing ⚠️
...ets/transcriber/transcription_options_group_box.py	66.66%	5 Missing ⚠️
buzz/transcriber/whisper_file_transcriber.py	75.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #820      +/-   ##
==========================================
- Coverage   83.07%   82.67%   -0.41%     
==========================================
  Files          85       85              
  Lines        4426     4530     +104     
==========================================
+ Hits         3677     3745      +68     
- Misses        749      785      +36     

Flag	Coverage Δ
Linux	81.94% <63.49%> (-0.39%)	⬇️
macOS	82.00% <61.11%> (-0.46%)	⬇️

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