.Net: Move Qdrant connector to use Qdrant.Client

[timheuer]

Similar to Milvus, the Qdrant connector should consider moving to use the Qdrant.Client

• https://github.com/qdrant/qdrant-dotnet
• https://www.nuget.org/packages/Qdrant.Client/

[stephentoub]

cc: @roji

[dmytrostruk]

FYI: Qdrant.Client is already used in new connector implementation: #6904

[markwallace-microsoft]

@timheuer thanks for creating this issue. I am going to close this as this is in progress as part of our Memory Connector update.

[timheuer]

This is great! I have one question but will ask on the merged item!