Rename several methods in EngineApiFacade to follow a consistent private naming convention, enhancing code clarity. Update EngineApiDelegates to remove redundant method definitions, streamlining the interface. Introduce EnginePublicInterface to encapsulate public API methods, improving organization and maintainability of the TTS system. Additionally, update the EngineCompositionBuilder to use the new scheduler worker state retrieval method.
Introduce multiple new modules including unified_engine_api, unified_engine_audio, unified_engine_bridge, unified_engine_builder, unified_engine_components, unified_engine_delegates, and unified_engine_runtime. These additions provide a comprehensive framework for managing TTS requests, audio packing, and engine state management, significantly improving the architecture and maintainability of the TTS system. The new structure supports asynchronous operations and enhances overall performance through better request handling and processing capabilities.
