Python: Copy Python extractor to codeql repo

python/extractor/tests/tokenizer/pep484.py

@@ -0,0 +1,19 @@
+#PEP 484 style annotations.
+
+def func(callee_type: CallableType,
+         formal_to_actual: List[List[int]],
+         strict: bool = True) -> List[Type]:
+    pass
+
+
+def func(self,
+         name: str,
+         args: List[str],
+         *,
+         cwd: str = None,
+         env: Dict[str, str] = None) -> None:
+    pass
+
+def specials(self, *varargs: vanno, **kwargs: kwanno):
+    pass
+