gh-127897: Update HACL* module from upstream sources to get:
- Lib_Memzero0.c: don't use memset_s() on macOS <10.9
- Use _mm_malloc() for KRML_ALIGNED_MALLOC on macOS <10.15
- Add LEGACY_MACOS macros, use _mm_free() for KRML_ALIGNED_FREE on macOS <10.15
This replaces the existing hashlib Blake2 module with a single implementation that uses HACL\*'s Blake2b/Blake2s implementations. We added support for all the modes exposed by the Python API, including tree hashing, leaf nodes, and so on. We ported and merged all of these changes upstream in HACL\*, added test vectors based on Python's existing implementation, and exposed everything needed for hashlib.
This was joint work done with @R1kM.
See the PR for much discussion and benchmarking details. TL;DR: On many systems, 8-50% faster (!) than `libb2`, on some systems it appeared 10-20% slower than `libb2`.
aeiouaeiouaeiouaeiouaeiouaeiou