Allow voice selection and personal voices

[vishnuravi]

Allow voice selection and personal voices

♻️ Current situation & Problem

Users can optionally specify a language for the voice to use when synthesizing speech, but cannot select a specific voice. As there are many voice options in iOS, including personal voices, this would be a great feature to support.

⚙️ Release Notes

• Allows users to specify a voice when generating speech.
• Provides an array of voices in the user's current locale.
• Provides a function for requesting permission and accessing personal voices.

✅ Testing

• Updates the test app with a selection of voices that can be chosen to synthesize speech.
• Personal voices cannot be tested on a simulator.

📝 Documentation

• Updates the README with an example of voice selection in a SwiftUI interface
• Adds instructions for requesting access to Personal Voices.

📝 Code of Conduct & Contributing Guidelines

By submitting creating this pull request, you agree to follow our Code of Conduct and Contributing Guidelines:

• I agree to follow the Code of Conduct and Contributing Guidelines.

[codecov]

Codecov Report

Attention: Patch coverage is 40.00000% with 15 lines in your changes missing coverage. Please review.

Project coverage is 26.71%. Comparing base (60b8cdb) to head (502eedd).

Additional details and impacted files

@@            Coverage Diff             @@
##             main       #8      +/-   ##
==========================================
+ Coverage   18.08%   26.71%   +8.63%     
==========================================
  Files           2        2              
  Lines         166      191      +25     
==========================================
+ Hits           30       51      +21     
- Misses        136      140       +4     

Files	Coverage Δ
...ces/SpeziSpeechSynthesizer/SpeechSynthesizer.swift	35.45% <40.00%> (+22.49%)	⬆️

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[PSchmiedmayer]

Looks great; I have fixed the codecov upload and some documentation improvements. Happy to see this merged 👍