Add /student endpoints

[feverdreme]

Summary

• Add working fireStore for endpoints POST, PUT, GET, DELETE
• Standardize error messages validating API requests
• Put all /student API code in /src/routes/students/index.ts

Test Plan

• Used postman to test API endpoints manually but eventually we will want some sort of API test suite.

Notes

• Not all form validation is done, eg. email regex validation.
• There should be fireStore collection instantiation code to make sure form fields are correct and so we can leverage fireStore validation tools as well.
• Array updates are not implemented yet so student attributes such as food allergies are unsupported.
  • Allergies should be enums, and there should be a defined AllergyList class.
  • Leveraging of fireStore class implicit conversion should be used.
• This is the first of many PRs for the /student endpoint. More is definitely needed before this is ready for the web.