Rust: Add a count of flow sources to rust/summary/summary-statistics.

Author: geoffw0

rust/ql/src/queries/summary/SummaryStats.ql

@@ -7,6 +7,7 @@
  */
 
 import rust
+import codeql.rust.Concepts
 import codeql.rust.Diagnostics
 import Stats
 
@@ -37,4 +38,8 @@ where
   key = "Inconsistencies - CFG" and value = getTotalCfgInconsistencies()
   or
   key = "Inconsistencies - data flow" and value = getTotalDataFlowInconsistencies()
+  or
+  key = "Taint sources - total" and value = count(ThreatModelSource s)
+  or
+  key = "Taint sources - active" and value = count(ActiveThreatModelSource s)
 select key, value

rust/ql/test/query-tests/diagnostics/SummaryStats.expected

@@ -10,3 +10,5 @@
 | Inconsistencies - data flow | 0 |
 | Lines of code extracted | 59 |
 | Lines of user code extracted | 59 |
+| Taint sources - active | 0 |
+| Taint sources - total | 0 |