Support Roaring-backed bitsets

[hicder-rddt]

Add BitsetView support for dense, live Roaring, and frozen Roaring filters, including count updates, dense conversion, offsets, and out-id mapping.

Preserve Roaring filters through search setup instead of rebuilding dense views, and add a typed Faiss fast path that expands Roaring filters into valid ID arrays for fp16, bf16, and int8 exhaustive distance paths.

Wire roaring into Conan and CMake dependencies and cover live and frozen Roaring bitsets with unit tests.

Part of the changes for milvus-io/milvus#51367

[sre-ci-robot]

Welcome @hicder-rddt! It looks like this is your first PR to zilliztech/knowhere 🎉

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[alexanderguzhva]

@hicder-rddt Hi, is it good to review the PR?

[hicder-rddt]

@alexanderguzhva thanks for looking. not yet, I'm still working on the corresponding change on Milvus side. That's why it's still in draft.

Once it's up, I think it's better to review together.

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