test: add kv cache event tests for disagg workers

[zhengd-nv]

This PR introduces new tests for some features required by kv cache aware routing on disaggregate serving.

• Getting KV cache events from workers
• KV cache blocks matching based on hash

This PR also fixed the issue that LLM.get_kv_cache_events returns List[List[dict]] instead of type annotated List[dict] and updated tests accordingly.

[zhengd-nv]

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Reusing PR_Github #2695 for commit 419586e