Migrate IVF-PQ from RAFT to cuVS

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List of changes I made during the migration:

• The unit tests are testing IVFPQ codepacker and build functions. So these functions had to be exposed (through cuvs/neighbors/details)
• The bitset filter is now located under `cuvs/neighbors/bitset_filter.cuh"
• search_with_filter is added to the public API, with bitset_filter
• Bitset is exposed in public API in a .hpp header, for inclusion in CUDA-free code. bitset::test() function has been temporarily disabled due to the switch from .cuh to .hpp.

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