Fully implement PureQueue

src/backing/containers/py_item.rs

@@ -8,12 +8,12 @@ pub struct PyItem(Py<PyAny>);
 
 impl PyItem {
     /// Creates a new instance
-    fn new(item: Py<PyAny>) -> Self {
+    pub fn new(item: Py<PyAny>) -> Self {
         PyItem(item)
     }
 
     /// Retrieves the internal data
-    fn item(self) -> Py<PyAny> {
+    pub fn data(self) -> Py<PyAny> {
         self.0
     }
 }