Add type hint for base_tas.py compile method (#1789)

Signed-off-by: Future Outlier <[email protected]>
Co-authored-by: Future Outlier <[email protected]>

flytekit/core/base_task.py

@@ -488,7 +488,7 @@ def construct_node_metadata(self) -> _workflow_model.NodeMetadata:
             interruptible=self.metadata.interruptible,
         )
 
-    def compile(self, ctx: FlyteContext, *args, **kwargs):
+    def compile(self, ctx: FlyteContext, *args, **kwargs) -> Optional[Union[Tuple[Promise], Promise, VoidPromise]]:
         """
         Generates a node that encapsulates this task in a workflow definition.
         """