andela / selene-ah-backend / 645

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feat(articleRating): implement feature for rating articles

- add a function to validationHelpers to check if a particular value exists in a table
- changed the msg property in the response object of the JWTAthentication file to message
- changed the msg property in the response object of the followers, getFollowers, and listUsers test files to message
- add the categoryId field to the articles model and migration
- add the relationship between the articles and categories to the articles model
- add the id field to the category model
- create the ratings model and migration
- add the relationship between the rating model and user model
- add the endpoints for rating articles
- add tests for the relationship between the user and article model, and the rating model
- add a middleware for validating the input for rating an article
- add a controller for handling calls to the rating endpoints
- refactor the articles controller to return the article ratings
- ceate a generalHelpers file for storing general helpers
- add tests for the controllers and end points

[Finishes #161779868]

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