Cherry-pick from b59e4a8d6c04ac25f902a2e2bc272d8d0d0dfc6c (field-level input serializers)
Cherry-pick from 5e91b69835083a4980a9a753cb57eafca1c129d3 (support options for {to/from}_dict)
Implemented basic IDatasetForm field/dataset processors (draft)