Gost validation tests (https://github.com/rekurt/gost-crypto/pull/1)

• feat: fix bugs in NewPrivKey, padToSize, HashID inference, and benchmarks
• feat: add RFC 6986 Streebog test vectors, long message and incremental tests
• feat: expand gost3410 test coverage to 81.5% with comprehensive validation tests
• feat: expand gostcrypto and kdf/hd test coverage with roundtrip, corruption, and fuzz tests
• feat: verify acceptance criteria - all tests pass, coverage >= 80% across all packages
• documentation fixes

What's Changed

• Gost validation tests by @rekurt in #1

New Contributors

• @rekurt made their first contribution in #1

Full Changelog: https://github.com/rekurt/gost-crypto/commits/v0.0.2