Write fetch function to get sections from Nebula API

[heartgg]

Function(s) location: fetch.ts (at least for now) Use types and interfaces via Typescript https://blog.logrocket.com/types-vs-interfaces-in-typescript/

Parameters:

• professor reference (string)
• course reference (string)

Output:

• Array of sections

Refer to https://github.com/demonlexe/sk.edge/blob/main/Extension/fetch.js

[KimotoNari]

Working on this