Introduce `cashu` to host the shared types, traits and other common code#519

Merged

thesimplekid merged 15 commits intocashubtc:mainfrom crodas:feature/cdk-common

Jan 12, 2025

+1,343-965

Commits on Jan 9, 2025

Introduce cashu and cdk-common crates.
crodas
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