SuperKMeans and Full Refactor (#12)

* Bye BOND and NARY

* Working refactor

* U8 works

* IVF2 working

* IVF2 working

* Adding SuperKMeans

* Build Index done

* End to end benchmark that creates indexes from scratch

* Refactor structure

* Serialize and deserialize

* Removing old benchmarks

* Refactoring bindings

* Get used memory in bytes

* Get in memory size

* Format fix

* FFTW working but deactivating for now

* Filtered search working

* Test suite

* Fixing bug with PDXTree

* Git Ignore

* Reintroducing FAISS and some readme stuff

* Hierarchical KMeans by default

* Fixing examples

* Fixing examples

* New PDX

* Compile benchmarks flag

* Commiting to hierarchical and cleaning a bit

* Fixing FFTW bug and enhancing performance

* Bumping SuperKMeans

* Adding cohere dataset

* Adding cohere dataset

* AVX512 fix

* AVX512 fix

* AVX512 fix

* Optimizing index creation

* Bump superkmeans

* Fixing unaligned pointer

* Final results and new README

* Removing benchmarks

Examples README edit

Verifying mirroring