feat: async close and multi-group search support

[paul-paliychuk]

[!IMPORTANT] The PR makes close() in Graphiti asynchronous, updates search for multiple group IDs, and bumps version to 0.3.5.

• close() in Graphiti is now asynchronous, improving resource management.
• SearchQuery in retrieve.py accepts group_ids as a list for multi-group searches.
• search() in retrieve.py updated for enhanced search flexibility.
• Minor updates in zep_graphiti.py for async close().
• Version bump in pyproject.toml from 0.3.4 to 0.3.5.

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