Python: Add call graph meta-query

python/ql/src/meta/analysis-quality/CallGraph.ql

@@ -0,0 +1,16 @@
+/**
+ * @name Call graph
+ * @description An edge in the points-to call graph.
+ * @kind problem
+ * @problem.severity recommendation
+ * @id py/meta/points-to-call-graph
+ * @tags meta
+ * @precision very-low
+ */
+
+import python
+import semmle.python.dataflow.new.internal.DataFlowPrivate
+
+from DataFlowCall c, DataFlowCallableValue f
+where c.getCallable() = f
+select c, "Call to $@", f.getScope(), f.toString()