Summary:
This PR adds a Python HNSW tutorial corresponding to the existing C++ HNSW tutorial.
The example creates synthetic vectors, builds an IndexHNSWFlat index, runs a search, and prints the nearest-neighbor IDs and distances for the final queries.
Pull Request resolved: https://github.com/facebookresearch/faiss/pull/5260
Reviewed By: mnorris11
Differential Revision: D107272616
Pulled By: alibeklfc
fbshipit-source-id: 721d7a1a95aa79150d6cb9653bd803065c82dcd7
