feat: Introduce new core components for conversation and speech management

- Added ConversationManager for managing conversation history with configurable limits.
- Implemented InputQueue for serial processing of input items.
- Created SpeechManager for handling text-to-speech generation and streaming.
- Developed StreamProcessor for processing LLM streams and forwarding events.
- Added TranscriptionManager for audio transcription using AI SDK.
- Introduced WebSocketManager for managing WebSocket connections and messaging.
- Updated VoiceAgent to support new architecture and improved socket handling.
- Refactored index files to export new core components.

dist/core/index.d.ts

@@ -0,0 +1,7 @@
+export { WebSocketManager } from "./WebSocketManager";
+export { SpeechManager, type SpeechManagerOptions } from "./SpeechManager";
+export { ConversationManager, type ConversationManagerOptions, } from "./ConversationManager";
+export { TranscriptionManager, type TranscriptionManagerOptions, } from "./TranscriptionManager";
+export { processFullStream, handleStreamChunk, type StreamResult, type StreamProcessorCallbacks, } from "./StreamProcessor";
+export { InputQueue, type QueueItem } from "./InputQueue";
+//# sourceMappingURL=index.d.ts.map