feat: add .inner_nodes() to [MerkleStore]

src/merkle/store/mod.rs

@@ -257,6 +257,15 @@ impl MerkleStore {
         Ok(tree_depth)
     }
 
+    /// Iterator over the inner nodes of the [MerkleStore].
+    pub fn inner_nodes(&self) -> impl Iterator<Item = InnerNodeInfo> + '_ {
+        self.nodes.iter().map(|(r, n)| InnerNodeInfo {
+            value: r.into(),
+            left: n.left.into(),
+            right: n.right.into(),
+        })
+    }
+
     // STATE MUTATORS
     // --------------------------------------------------------------------------------------------