v0.4.3 Bug fixes and code cleanup

What's Changed

• [Rust] L2 distance on not aligned data by @eddyxu in #779
• [Rust] Move L2 to linalg module by @eddyxu in #781
• [Rust] Build DiskANN index by @eddyxu in #763
• Refactor cosine distance into linalg module by @eddyxu in #786
• google cloud storage fixes by @gsilvestrin in #782
• Fix unaligned normalization bug on arm64 by @eddyxu in #789
• Speed up vector index tests by reducing dataset size by @changhiskhan in #790

Full Changelog: v0.4.2...v0.4.3