Push the creation of date managing SQL into the database driver
The DatabaseConnection class has added several new methods and abstract methods:
Add cloneTable() to DatabaseSchema
The DatabaseSchema added a new method and abstract method:
Add isImmutable() to ConfigStorageInterface
The ConfigStorageInterface added a new method:
/**
* Returns whether data in this object can be changed.
*
* @return bool
* TRUE if the object cannot be changed, FALSE if it can be changed.
*/
public function isImmutable();