Numerous typos in code

[Harry-Chen]

Summary

Some typos in the code should be handy to fix. They are all detected by Debian's litian with tag spelling-error-in-binary.

Faiss version: dc55e11874e4e32d0f04a9d62156ebe2ca25192d

• hanlde -> handle: some files under faiss/impl/
• identifer -> identifier: faiss/AutoTune.h
• impemented -> implemented: faiss/IndexIVFFastScan.cpp, faiss/invlists/BlockInvertedLists.cpp
• implemetation -> implementation: faiss/IndexIVF.h
• ouptut -> output: faiss/impl/AuxIndexStructures.h, faiss/utils/hamming.cpp
• strcuture -> structure: some files under faiss/*.h
• tranforms -> transforms: faiss/IndexPreTransform.h
• neighors -> neighbors: faiss/utils/distances.h

I can submit a PR if that is acceptable.

[alexanderguzhva]

@Harry-Chen yes, please do!