- Add ChatHistory interface and in-memory token bounded implementation: TokenCountSlidingWindowChatHistory.java
- Fix a bug with AssistantMessage hash/equality implementation.
- Add HistoryChatClient unit tests.
- Implement a ChatClient decorator with history support.
- expose PromptHistoryAgumenter hook with default implementation.
- Special handling of System messages.
Tested with OpenAI only.
Comment From: tzolov
Replaced by #634