OpenAPI docs and rating serialization for thumb stats when quering getWhiskey(id)

This PR includes OpenAPI documentation for the endpoints. The docs can be seen by visiting localhost:8000/ or api.unrated.no/ when it gets deployed.

Also includes some added serialzied fields to each rating when query getWhiskey(id) is called:

# Rating
votedThumb: Thumb # This will be populated when getWhiskey is used and user has liked a the rating.
goodThumbs: Int # Populated when getWhiskey is used and counts thumbs that isGood is true
badThumbs: Int # Populated when getWhiskey is used and counts thumbs that isGood is false

some unit tests + some needed refactoring.

Unrated-Limited-Unlimited / ua-backend

OpenAPI docs and rating serialization for thumb stats when quering getWhiskey(id) #40

Quality Gate passed