Implement a way to list which serializer for each backend

[argaen]

Some serializers may not be compatible with a given backend. This error would be better if its raised during instantiation time rather than when calling the actual operations. The error should also return which serializers are supported.

[argaen]

This may be related with #7. More than list of serializers, maybe some advanced way to which encoding is supported by which serializer/backend. Needs some thinking.