Problems on HNSW implementation

[YujianFu97]

Thanks for your excellent work on the implementation!
It seems the algorithm for HNSW is not fully released, i.e. the makefile and the neighbor.h are not included, will they be released?

[magdalendobson]

We don't have any plans to release them on the main branch of ParlayANN in the near future due to some file compatibility issues that will take significant work to overcome. They may be available in a public repository elsewhere; I'll ask my coauthor @DapperX to chime in and confirm.