Rust: Add summary query rust/summary/query-sinks.

rust/ql/src/queries/summary/QuerySinks.ql

@@ -0,0 +1,25 @@
+/**
+ * @name Query Sinks
+ * @description Lists query sinks that are found in the database. Query sinks are flow sinks that
+ *              are used as possible locations for query results. Cryptographic operations are
+ *              excluded (see `rust/summary/cryptographic-operations` instead).
+ * @kind problem
+ * @problem.severity info
+ * @id rust/summary/query-sinks
+ * @tags summary
+ */
+
+import rust
+import codeql.rust.dataflow.DataFlow
+import codeql.rust.security.SqlInjectionExtensions
+import Stats
+
+/**
+ * Gets a kind of query for which `n` is a sink (if any).
+ */
+string getAQuerySinkKind(DataFlow::Node n) {
+  (n instanceof SqlInjection::Sink and result = "SqlInjection")
+}
+
+from DataFlow::Node n
+select n, "sink for " + strictconcat(getAQuerySinkKind(n), ", ")