feat: add-browser-agent-memory-prunning-with-example

[YunfeiZHAO]

Description

For the browser agent, we are caching the whole content from the browser function tool.
But in history messages, we only need to keep the content-related information; the labels and content type can be pruned to reduce the whole context length.

example: examples\agents\agent_browser_call_cache.py
The pruned memory demonstration:

Checklist

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✨ Finishing touches

🧪 Generate unit tests (beta)

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