add NoteId hashbrown Equivalent impl

Signed-off-by: kernelkind <kernelkind@gmail.com>

crates/enostr/Cargo.toml

@@ -20,3 +20,4 @@ url = { workspace = true }
 mio = { workspace = true }
 tokio = { workspace = true }
 tokenator = { workspace = true }
+hashbrown = { workspace = true }

crates/enostr/src/note.rs

@@ -143,3 +143,9 @@ impl<'de> Deserialize<'de> for NoteId {
         NoteId::from_hex(&s).map_err(serde::de::Error::custom)
     }
 }
+
+impl hashbrown::Equivalent<NoteId> for &[u8; 32] {
+    fn equivalent(&self, key: &NoteId) -> bool {
+        self.as_slice() == key.bytes()
+    }
+}