refactor: restore custom fmt::Debug for InnerEntry

this needs to follow Cid as we don't really need the Cid's fmt::Debug
impl.

unixfs/src/walk.rs

@@ -311,7 +311,6 @@ impl Walker {
 }
 
 /// Represents what the `Walker` is currently looking at.
-#[derive(Debug)]
 struct InnerEntry {
     cid: Cid,
     kind: InnerKind,
@@ -534,6 +533,18 @@ impl InnerEntry {
     }
 }
 
+impl fmt::Debug for InnerEntry {
+    fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
+        fmt.debug_struct("InnerEntry")
+            .field("depth", &self.depth)
+            .field("kind", &self.kind)
+            .field("cid", &format_args!("{}", self.cid))
+            .field("path", &self.path)
+            .field("metadata", &self.metadata)
+            .finish()
+    }
+}
+
 /// Representation of the walk progress.
 #[derive(Debug)]
 pub enum ContinuedWalk<'a> {