[Answer] Implement AnswerLikes entity using Typeorm

[ahmedeid6842]

Requirements

This task for implements entity to store userIds who likes a answer by the answerId

Done:

• Create AnswerLikes entity.
• Added AnswerLikes columns id, user_id and answer_id
• Setup the relations between the AnswerLikes with the User and Answer table using TypeORM.

  follow this ERD for the datatypes and constraints.

• Take advantage of Typeorm Generators to set the constraints and validation.
• Added the created entity to Postgres entities.