feat: adds __iter__ method support to ActiveSequence

Author: tdstein

src/posit/connect/resources.py

@@ -162,6 +162,9 @@ def __getitem__(self, index: slice) -> Sequence[T]: ...
     def __getitem__(self, index):
         return self._data[index]
 
+    def __iter__(self):
+        return iter(self._data)
+
     def __len__(self) -> int:
         return len(self._data)