Enhancement: Add Student CSFA Income and Expenses Sections to Student Application Endpoint Response

[klondikemarlen]

Relates to icefoganalytics/student-financial-aid#2
Fixes #33

Context

As part of the "view submitted applications and their current status" project, this task covers returning the student CSFA income and expenses data.

Data Format

{
  "id": "some-application-id",
  "csfaIncome": { "incomes": [] },
  "csfaExpenses": { "expenses": [] },
}

Testing Instructions

1. Boot the sfa-client repo via API_PORT=3100 dev up
2. Boot the student-financial-aid front- and back-ends.
3. Log in to the app at http://localhost:8080/
4. Go to http://localhost:3000/api/portal/students/5/applications/3808 and you will see the empty CSFA income and CSFA expenses fields.
5. Go to http://localhost:3000/api/portal/students/124478/applications/30356 and you will see some CSFA income values.
6. Go to http://localhost:3000/api/portal/students/8634/applications/1995 and you will see some CSFA expense values.

[datajohnson]

👍