Ruby: add meta-query for calls to summarized callables

ruby/ql/src/queries/meta/SummarizedCallableCallSites.ql

@@ -0,0 +1,16 @@
+/**
+ * @name Summarized callable call sites
+ * @description A call site for which we have a summarized callable
+ * @kind problem
+ * @problem.severity recommendation
+ * @id rb/meta/summarized-callable-call-sites
+ * @tags meta
+ * @precision very-low
+ */
+
+import codeql.ruby.AST
+import codeql.ruby.dataflow.FlowSummary
+
+from Call invoke, SummarizedCallable f
+where f.getACall() = invoke or f.getACallSimple() = invoke
+select invoke, "Call to " + f