Add the Option to Run Tools Sequentially

[renkehohl]

I was implementing an agent to automate Git-Workflows. The Git-Tool enabled the agent to execute Git commands on my Computer. When I asked the agent to add the latest changes and then to commit and push them, it ran into an index lock. This is because all the agent wants to execute all tool calls at once. It would be nice to have the option to either run the tools all at once or sequentially.

[samuelcolvin]

@sydney-runkle we can add this to ModelSettings I guess.

@renkehohl you can probably avoid the issue you're having using asyncio.Lock, either making the lock global or putting it in dependencies.