Python bindings for the official Rust implementation of BLAKE3.

BLAKE3 is a cryptographic hash function that is much faster than MD5, SHA-1,
SHA-2, and SHA-3, yet is at least as secure as the latest standard, SHA-3.

Features:
- Fast hashing (up to 2-3x faster than SHA-256)
- Parallelism using multiple threads
- Extendable output (XOF)
- Keyed hashing and key derivation
- Compatible with Python's hashlib module