implement btc/bch/zcash signing in rust#1143
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This pull request implements signing support for Bitcoin, Bitcoin Cash, Litecoin, Dogecoin, and Zcash, introducing a new BitcoinChainSigner and a transaction planner with fee estimation. The review feedback identifies critical performance improvements, such as precomputing sighash components to prevent O(N^2) complexity and optimizing the use of cryptographic contexts. Additionally, the reviewer recommends implementing dust threshold checks for transaction amounts and utilizing standard library abstractions for address parsing to enhance code reliability and maintainability.
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