Sqlite: Add change set iterator

Task-number: QDS-2998
Change-Id: I7bfa8af51d9d7e6122902ee132ad51019e20afb5
Reviewed-by: Tim Jenssen <tim.jenssen@qt.io>
Reviewed-by: Thomas Hartmann <thomas.hartmann@qt.io>

src/libs/sqlite/sqlitesessions.h

@@ -26,6 +26,7 @@
 #pragma once
 
 #include "sqlitedatabase.h"
+#include "sqlitesessionchangeset.h"
 #include "sqlitewritestatement.h"
 
 extern "C" {
@@ -81,6 +82,8 @@ public:
     void applyAndUpdateSessions();
     void deleteAll();
 
+    SessionChangeSets changeSets() const;
+
 private:
     void attachTables(const Utils::SmallStringVector &tables);