add few-shot prompting to `rai` demo projects

Is your feature request related to a problem? Please describe.
Currently, demo projects in rai use prompts that contain:

• robot identity from rai_whoami (link)
• general mission for the robot (link)
• tips and guidelines about ros2 (link)
• tips and guidelines about the task (link, link)
• documentation of attached tools (link)

Describe the solution you'd like
Few-shot prompting (https://www.promptingguide.ai/techniques/fewshot) is a technique commonly used to improve LLM agents' performance. The current demo shows that LLMs can achieve good zero-shot capabilities, but with few-show prompting, they have the potential to be significantly improved.

Few-shot prompting can be applied by adding successful interactions to the system prompt. This can be a sequence of tool calls or tool calls with specific parameters.

Describe alternatives you've considered
Fine-tuning is a next step, but few-shot should be checked first, as much cheaper and easier.

Additional context