[Feature]:  Milvus group search support ivf_pq.

We need group-search, and I am also very cost-sensitive ~so hope to use ivf_pq index, but now milvus does not support it.
And We  need  it in 2.5 ~ 

<img width="942" height="102" alt="Image" src="https://github.com/user-attachments/assets/c84f9d0c-b245-4a7b-81a8-9b4cfbe33f64" />
