fixes mem0 with valkey/redis issue

[MatthiasHowellYopp]

changes to support using mem0 with valkey/redis as external memory provider for crewai

fixes #4031

---

Note

Flattens single-condition search filters for Valkey/Redis vector stores in Mem0 storage and adds tests covering flattening, non-flattening, and None-config cases.

• Mem0 Storage (crewai/memory/storage/mem0_storage.py):
  • Search filter handling: For provider in {"valkey", "redis"}, flatten single-condition AND/OR filters to a simple dict (e.g., {"run_id": "..."} or {"agent_id": "..."}).
  • Robust config parsing: Safely handle None or missing local_mem0_config / vector_store without raising errors.
• Tests (tests/storage/test_mem0_storage.py):
  • Add coverage for Valkey/Redis filter flattening and retention of structure when multiple conditions exist.
  • Add cases ensuring non-Valkey/Redis providers keep AND structure.
  • Add cases handling None local_mem0_config and vector_store values without errors.

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