refactor: migrate to question sets for person qs

This means we're starting to use the same system for person questions
as for relationship questions

people/migrations/utils/question_sets.py

@@ -0,0 +1,23 @@
+
+import typing
+
+from django.core.exceptions import ObjectDoesNotExist
+
+
+def port_question(apps, question_text: str,
+                  answers_text: typing.Iterable[str]):
+    PersonQuestion = apps.get_model('people', 'PersonQuestion')
+
+    try:
+        prev_question = PersonQuestion.objects.filter(
+            text=question_text).latest('version')
+        question = PersonQuestion.objects.create(
+            text=question_text, version=prev_question.version + 1)
+
+    except ObjectDoesNotExist:
+        question = PersonQuestion.objects.create(text=question_text)
+
+    for answer_text in answers_text:
+        question.answers.get_or_create(text=answer_text)
+
+    return question