feat: enable prompt option for Whisper.cpp and OpenAI API

[chidiwilliams]

Resolves #705

[codecov]

Codecov Report

Attention: Patch coverage is 97.22222% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 80.11%. Comparing base (a4a3369) to head (8d16e0a).

Files	Patch %	Lines
...ets/transcriber/transcription_options_group_box.py	90.90%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #706      +/-   ##
==========================================
+ Coverage   80.06%   80.11%   +0.04%     
==========================================
  Files          82       83       +1     
  Lines        3828     3837       +9     
==========================================
+ Hits         3065     3074       +9     
  Misses        763      763              

Flag	Coverage Δ
Linux	74.19% <97.22%> (+0.06%)	⬆️
Windows	81.40% <96.96%> (+0.03%)	⬆️

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