Spring AI Integrate ElevenLabs Text-to-Speech (TTS) as a supported provider within Spring AI.

Justification:

Expanded Options: Currently, Spring AI only supports OpenAI's Speech API for TTS. Adding ElevenLabs diversifies provider choice, offering users alternative pricing, voice quality, and specialized features.

High-Quality Voices: ElevenLabs is renowned for its natural-sounding, expressive AI voices, including voice cloning capabilities. This significantly enhances the potential for creating engaging audio experiences.

Broader Language: ElevenLabs supports up to 32 languages.

Current Behavior

Currently, Spring AI only provides built-in support for OpenAI's Speech API. There is no way to use ElevenLabs for TTS within the Spring AI framework. This limits user choice and prevents leveraging ElevenLabs' unique strengths.

Additional context

ElevenLabs recently secured significant $180M Series C funding, indicating strong market validation and growth potential.