Create the artifact serializers. Currently for serializers related to
features that require external resources, such as W2VClassesDictionary
objects, the convention is to add its element tag name as key of the serializer map.
For example, the element tag name for the WordClusterFeatureGenerator which
uses W2VClassesDictionary objects serialized by the W2VClassesDictionarySerializer
is 'wordcluster', which is the key used to add the serializer to the map.