feat: add support for cashu wallet (nip60 & nip61) (#71)

Reviewed-on: #71

crates/nip60/Cargo.toml

@@ -0,0 +1,26 @@
+[package]
+name = "nip60"
+version.workspace = true
+edition.workspace = true
+publish.workspace = true
+
+[dependencies]
+state = { path = "../state" }
+common = { path = "../common" }
+
+gpui.workspace = true
+gpui_tokio.workspace = true
+nostr.workspace = true
+nostr-sdk.workspace = true
+anyhow.workspace = true
+smallvec.workspace = true
+log.workspace = true
+flume.workspace = true
+serde_json.workspace = true
+futures.workspace = true
+hkdf.workspace = true
+sha2.workspace = true
+tokio = { version = "1", default-features = false, features = [ "rt" ] }
+
+cdk.workspace = true
+cdk-redb.workspace = true