Polling endpoint

[prabalsingh24]

fixes #74
`

• create a new folder src/routes/api/submissions

  • create an index.ts file which'll act as the url map
  • create an controller.ts file which'll export an object containing the handler
  • mount /api/submissions/:id endpoint to the polling controller

• write test for the api

  • Test if the API fives 403 if the api key is not provided or incorrect
  • Test if the API gives 404 if submission id not found
  • Test if the API gives returns the serialized submission model
  • update the test here and here

`

[prabalsingh24]

@jatinkatyal13 Have a look at this when you're free :)

[jatinkatyal13]

Nice Job 🚀

[boss-contributions-bot]

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