Decouple Speech to Text Service from ViewModel

[AugustAtSeattle]

Refactor the app to decouple speech-to-text functionalities from the ViewModel by implementing a dedicated service manager.

Tasks:

• [ ] 1. Create a Service Manager for Speech Recognition.
• [ ] 2. Integrate GPT Whisper in Service Manager.
• [ ] 3. Fallback to Local SFSpeechRecognizer.
• [ ] 4. Include 15 Seconds of Silent Detection in Service Manager.

This enhancement aims to improve modularity and flexibility in handling different speech-to-text services.

[AugustAtSeattle]

1. Create a Service Manager for Speech Recognition Task Description: Implement a service manager that abstracts the speech recognition functionalities. Objective: Centralize speech recognition handling in a single service manager class, making the ViewModel leaner and more focused.
2. Accommodate Connection to Whisper Service Task Description: Integrate GPT Whisper as a primary service for speech-to-text within the service manager. Objective: Provide an option to use GPT Whisper for enhanced speech recognition capabilities when available.
3. Fallback to Local SFSpeechRecognizer Task Description: Implement a fallback mechanism to use local SFSpeechRecognizer if the Whisper service is unavailable. Objective: Ensure the app has a reliable speech-to-text functionality even without internet connectivity or if Whisper service is down.
4. Integrate 15 Seconds Silent Detection in Service Manager Task Description: Move the 15 seconds silence detection logic into the service manager. Objective: Manage all aspects of speech recognition, including silence detection, within the service manager for better encapsulation and reusability.

[AugustAtSeattle]

• [x] 1. Create a Service Manager for Speech Recognition.
• [x] 2. Create a Placeholder for GPT Whisper
• [x] 3. Migrate Local SFSpeechRecognizer.
• [x] 4. Migrate 15 Seconds of Silent Detection