.Net: Update Weaviate Memory Connector to new Memory Design

[markwallace-microsoft]

Memory ADR is here: https://github.com/microsoft/semantic-kernel/issues/5887

• [x] Implement new abstractions
• [x] Unit tests
• [x] Integration tests
• [x] Implement search abstractions
• [x] Add support for generic data model
• [x] Document any limitations in the implementation
• [ ] Implement a basic RAG samples
• [ ] Work with Sofia on a new Blog post
• [ ] Obsolete the old implementation
• [ ] Create task to graduate the Memory Connector