refactor(chunk): add size_hint to chunk::IntoIter

src/chunk.rs

@@ -177,5 +177,12 @@ impl Iterator for IntoIter {
     fn next(&mut self) -> Option<Self::Item> {
         self.inner.next()
     }
+
+    #[inline]
+    fn size_hint(&self) -> (usize, Option<usize>) {
+        self.inner.size_hint()
+    }
 }
 
+impl ExactSizeIterator for IntoIter {}
+