[Feature] Add memory properties to StrayCat

[valentimarco]

Description

Related to issue #818, point 3

With this PR, I added new properties to StrayCat and some types (YES):

1. user_message(self) -> str, return the query of the user
2. memory_vector_client(self) -> QdrantClient, return the QdrantClient (Is is useful? personally yes, if i want to do some strange stuff...)
3. <name collection>_memory(self) -> VectorMemoryCollection, return a VectorMemoryCollection instance of the selected memory. Usuful to search, add or destroy vectors in a specific collection.

Nothing new is added, "old piero" did a great job when designing the VectorMemory!

To search points use recall_memories_from_embedding(embedding, metadata=None, k=5, threshold=None ).

Maybe #848 should be method of VectorMemoryCollection??

Type of change

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [x] This change requires a documentation update

Checklist:

• [x] My code follows the style guidelines of this project
• [x] I have performed a self-review of my own code
• [x] I have commented my code, particularly in hard-to-understand areas