Sqlite: Improve Sqlite wrapper

It is now possible to read values at once.

for (auto [name, value] : statement.tupleValues<String, int>(1000, "foo", 20))
   ....

Change-Id: I3d4bc5218810b4620e1df625126aa490f30bbc71
Reviewed-by: Tim Jenssen <tim.jenssen@qt.io>

tests/unit/unittest/sqlstatementbuilder-test.cpp

@@ -30,6 +30,7 @@
 
 using namespace ::testing;
 
+using Sqlite::ColumnType;
 using Sqlite::SqlStatementBuilder;
 using Sqlite::SqlStatementBuilderException;