Add Student Dependents Section to Student Application Endpoint Response

[klondikemarlen]

Relates to icefoganalytics/student-financial-aid#2

Context

As part of the "view submitted applications and their current status" project, this task covers returning the student dependents data. Depending on how that goes I might add in other sections such as:

other-fields.json

{
  "csfaAccomodation": {},
  "csfaIncome": { "incomes": [] },
  "csfaExpenses": { "expenses": [] },
  "parents": {},
  "parentDependants": {},
  "spouse": {},
  "documents": {}
}

Data Format

{
  "id": "some-application-id",
  "studentDependants": { "dependants": [] },
}