[feat] update for tool handling generically

[csells]

Currently, the AI Toolkit allows for tool usage if the provider exposes that functionality. However, it's a big pain to manage the history in that case, since the tool calls and results have no mappings and you want to keep those in the history.

And, the tool handling changes based on what LLM you're using.

But worst of all, if the LlmChatView or app in some other way calls DartanticProvider.history = ..., then all of the tool calls in the history will be lost.😭

[runyaga]

Hi. I was wondering if your thinking if your taking ag-ui
https://docs.ag-ui.com/ under consideration in V2. I think some of the sample interactions could be really compelling, specifically, human-in-the-loop.

[csells]

hey, @runyaga . that's a new one on me. what scenarios would it enable? what integrations already exist that would work in a Dart/Flutter environment? is this anything to do with tools or should it be moved to a new top-level feature request?