BitGo / rust-bitcoin

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feat(crypto): add Zcash ZIP-243 sighash implementation

Add support for Zcash transaction signature validation following ZIP-243
standard. The implementation uses BLAKE2b-256 with personalization strings
for computing signature hashes for transparent inputs in Zcash transactions.

Key features:
- Implement ZIP-243 sighash algorithm for Zcash transactions
- Add SighashCacheZcashExt trait for computing Zcash sighashes
- Support both P2PKH and P2SH inputs in Zcash transparent transactions
- Provide PSBT signing extension for Zcash inputs
- Include test vectors from ZIP-243 specification

Issue: BTC-2555

Co-authored-by: llm-git <llm-git@ttll.de>

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