Preparation for Keyset V2 - #146
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…n) (#8) Replaces SHA-256 hash approach for V2 keyset ID derivation with math/big.Int based keysetIdToBigInt() from elnosh/gonuts upstream (lescur97's PRs elnosh#146, elnosh#147). The big.Int approach is cleaner, handles arbitrary-length IDs without overflow risk, and supports both hex and base64 keyset ID formats. Adds CheckCollidingKeysets() to detect keyset ID collisions after modulo reduction — prevents two different keyset IDs from mapping to the same BIP32 derivation path. Adopted from: elnosh#146 elnosh#147 6 new tests: V2 keyset derivation, hex/base64 parsing, collision detection. Co-authored-by: Amperstrand <amperstrand@localhost>
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