Python: Add support for PEP-798

python/downgrades/eb5fc917c79bb23ce2de4a022f3e566d57a91be9/py_bools.ql

@@ -0,0 +1,12 @@
+class BoolParent extends @py_bool_parent {
+  string toString() { result = "BoolParent" }
+}
+
+// Drop py_bools rows for Import and ImportStar parents,
+// since the old schema does not include them in @py_bool_parent.
+from BoolParent parent, int idx
+where
+  py_bools(parent, idx) and
+  not parent instanceof @py_Import and
+  not parent instanceof @py_ImportStar
+select parent, idx