Configuration entities are now supported by the typed data system

Configuration entity data types are now supported by the typed data system. There are derived in a similar way to content entities - ie. entity:$entity_type and entity:$entity_type:$bundle data types.

Potential for example usages:

$config_entity = ConfigTest::load('my_config_id');
$typed_config_entity = ConfigEntityAdapter::createFromEntity($config_entity);
$violations = $typed_config_entity->validate();