Add support for workflow jobs and steps (#1951)

Co-authored-by: Enrico Minack <github@enrico.minack.dev>

github/WorkflowStep.pyi

@@ -0,0 +1,21 @@
+from datetime import datetime
+from typing import Any, Dict
+
+from github.GithubObject import CompletableGithubObject
+
+class WorkflowStep(CompletableGithubObject):
+    def __repr__(self) -> str: ...
+    def _initAttributes(self) -> None: ...
+    def _useAttributes(self, attributes: Dict[str, Any]) -> None: ...
+    @property
+    def completed_at(self) -> datetime: ...
+    @property
+    def conclusion(self) -> str: ...
+    @property
+    def name(self) -> str: ...
+    @property
+    def number(self) -> int: ...
+    @property
+    def started_at(self) -> datetime: ...
+    @property
+    def status(self) -> str: ...