feat(awsutil): add sigv4 for btc rpc provided by managedblockchain#127

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anvztor wants to merge 5 commits intodevelopfrom

Commits on Sep 28, 2025

feat(awsutil): add managedblockchain sigv4 auth method
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Commits on Jan 16, 2026

Commits on Jan 17, 2026

fix(awsutil): set btcd backend version
anvztor
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