Introducing AI Transport v0.3.0

AI Transport v0.3.0 builds on the foundational concept from v0.2.0 that a session is a channel by introducing features like presence and LiveObjects, which enable real-time updates and shared state management in AI sessions. With presence, users and agents can see who's online and manage participant states, enhancing interaction through indicators such as "typing..." or cursor positions. The update also simplifies codec creation by making the codec interface declarative, allowing the transport to manage event ordering, de-duplication, and replay, thus reducing the developer's workload. LiveObjects, which need to be manually enabled, allow for synchronized shared states, such as task progress or shared documents, on the same channel as conversations, ensuring all clients are updated in real time. These advancements make AI Transport a more robust and user-friendly platform for developing multi-party, resumable AI conversations.