cesar/cdk: Cashu Development Kit @ bb46e85683258f71af6e66adb61b9c14242f2509

Cesar Rodas 960abb63a4 Fixed bug with foreign keys		пре 7 месеци
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migrations	003a8f1b47 feat: signature on mint witness	пре 10 месеци
error.rs	8fe0982c6d Introduce `cashu` to host the shared types, traits and other common code (#519)	пре 9 месеци
memory.rs	c6118b1f8f Drop the in-memory database	пре 7 месеци
mod.rs	960abb63a4 Fixed bug with foreign keys	пре 7 месеци