This commit introduces a new `spring-ai-elevenlabs` module to integrate ElevenLabs' TTS service into Spring AI.
Key Features:
- **New Module:** `spring-ai-elevenlabs` with a Spring Boot starter for auto-configuration.
- **Core Classes:**
- `ElevenLabsTextToSpeechModel`: Implements `TextToSpeechModel` and `StreamingTextToSpeechModel`.
- `ElevenLabsTextToSpeechOptions`: Configurable TTS options (voice, format, speed, etc.).
- `ElevenLabsApi` and `ElevenLabsVoicesApi`: Low-level REST clients for ElevenLabs APIs.
- DTOs: `Speech`, `TextToSpeechMessage`, `TextToSpeechPrompt`, `TextToSpeechResponse`.
- **Auto-configuration:**
- `ElevenLabsAutoConfiguration`, `ElevenLabsConnectionProperties`, and `ElevenLabsSpeechProperties`.
- **Functionality:**
- Text-to-speech conversion with ElevenLabs voices.
- Real-time streaming playback support.
- Flexible runtime configuration via properties and model options.
- **Documentation:** Updated Spring AI reference guide with usage examples.
- **Tests:** Includes unit and integration tests for both success and failure scenarios.
Note:
- Some `tts` package classes will be relocated to the `core` module to support shared TTS abstractions, including upcoming OpenAI Speech API support.
- Added metadata support to `TextToSpeechResponse`.
- Added tests and updated documentation.
Signed-off-by: Alexandros Pappas <apappascs@gmail.com>
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