[Feature]: Implement Moatless Tools-inspired Function Calling

[openhands-agent]

What problem or use case are you trying to solve?
Implement a function calling option in OpenHands similar to Moatless Tools, inspired by Albert Örwall's results using Deepseek V3.

Describe the UX of the solution you'd like
This feature should enhance the current function calling options by integrating it as a third toggle, potentially increasing task-solving efficiency.

Do you have thoughts on the technical implementation?
We could analyze the existing function calling mechanism in moatless-tools to adapt and enhance OpenHands. Specifically, we should clone and analyze the repo here to understand what is going on with the most recent deepseek results: https://github.com/aorwall/moatless-tools

Albert's performance improvements using this approach provide a solid baseline.

Describe the alternatives considered
N/A

Additional context
Albert scored 30.7% with Moatless Tools on problem tasks. Discussion and comparison of trajectories to OpenHands evals could use this functional similarity to improve OpenHands’ performance. Reference: Tweet.

Issue Created By: Graham Neubig on Slack

[openhands-agent]

OpenHands started fixing the issue! You can monitor the progress here.