Form Completion Workflow

https://docs.google.com/a/dimagi.com/document/d/1V8Oue_43GnMTYV2OKNx5MRvAIdxFs7TQtt_HN_-6V50/edit#heading=h.v1gf9mhs7nhi

https://confluence.dimagi.com/display/ccinternal/Form+Completion+Technical+Spec#FormCompletionTechnicalSpec-ImplementationGeneralization