Sqlite: Add session support

Session are captured by hooking in the sqlite changes. They are saved in
blobs and containing inserts, update and deletes. Because the are
semantically coupled to translactions we add a

Change-Id: Ie095558ebc50601fcaae32958ebeeb98b72d73b9
Reviewed-by: Tim Jenssen <tim.jenssen@qt.io>

src/libs/sqlite/constraints.h

@@ -38,9 +38,14 @@ class Unique
     friend bool operator==(Unique, Unique) { return true; }
 };
 
+enum class AutoIncrement { No, Yes };
+
 class PrimaryKey
 {
     friend bool operator==(PrimaryKey, PrimaryKey) { return true; }
+
+public:
+    AutoIncrement autoincrement = AutoIncrement::No;
 };
 
 class NotNull