Backend - Application Submission - TypeORM setup, Express routing

[alexzhang1618]

This can be done in 2 PRs

1. TypeORM / Postgres setup
2. Express routing, business logic / form validation

Add new TypeORM / tables for applications

Application Submission

All form details will be kept on the frontend for easy iteration.

1. Check DB to see if the user already submitted the application form
   1. If so, edit instead of create
   2. we can have an enum
      1. FormType = "Application" | "Waiver" | "Hacker Details"
      2. Might need some additional business logic down the line to make sure only certain app statuses can fill out some forms.
2. User fills out the form on the frontend + submits
3. We validate the form on the backend
4. Create a new record or update the form in the database
   1. Note: if we’re doing resumes as actual files, we might need S3 here
   2. Let’s v0 this to be GDrive links first, then do S3 as a fast-follow (still during break though)

Add routes to GET POST PATCH DELETE /response

• POST /responses
• PATCH /responses/{uuid}
  • Shut POST and PATCH off when we stop accepting apps
    • Like directly in the route handler for business logic
• GET /responses/{uuid}
• DELETE /responses/{uuid}
• GET /user/forms
  • Get all form responses for a user