[FEATURE] Introduce "Tool Choice = required" in Tool Agent

[bufibufon]

Describe the feature you'd like
Introduce 'Tool Choice' to Tool Agent like in openAi assistant module, to force the Tool Agent to always use a tool.

Additional context
I have a Tool agent integrated with Slack, when agent sends multiple messages in thread, I can only capture the first one from flowise prediction API. I've created a cutom tool to send all messages through it, but the agent sometimes fails to use the tool and provides a reply as text response. Using "tool choice" = 'required' in OpenAI assistants forces the assistant to behave as expected, it would be great to have this option in Flowise Tool Agent.

[vijaykammili]

@HenryHengZJ - I'm facing this issue with Tool Agent. This would be a great addition. Thank you @bufibufon