chore: reorganize rust crates

crates/avatars/src/hash.rs

@@ -0,0 +1,21 @@
+use std::fmt::Display;
+
+use sha2::{Digest, Sha256};
+
+#[derive(Debug)]
+pub struct Hash([u8; 32]);
+
+impl Hash {
+    pub fn sha256(data: &[u8]) -> Hash {
+        let mut hasher = Sha256::new();
+        hasher.update(data);
+        Hash(hasher.finalize().into())
+    }
+}
+
+impl Display for Hash {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        let encoding = data_encoding::BASE32_NOPAD;
+        write!(f, "{}", encoding.encode(&self.0[..16]).to_lowercase())
+    }
+}