Feat/branch endpoints

[Mariettrodrigo]

This pull request adds full CRUD (Create, Read, Update, Delete) support for a new "Branch" resource to the application, including model definition, API routes, controller, service logic, database migrations, and comprehensive tests. The implementation follows the existing project structure and ensures robust validation and error handling.

The most important changes are:

Branch API Implementation:

• Added new RESTful endpoints for branches (/api/v1/branches) by introducing branchRoutes in server.js, defining the routes in src/routes/branch.js, and connecting them to the main app. [1] [2] [3]
• Implemented the BranchController with methods for adding, retrieving (all and by ID), updating, and deleting branches, including input validation and error handling.
• Created BranchService to encapsulate business logic for branch operations, interacting with the database via Sequelize.

Database and Model Layer:

• Defined the Branch Sequelize model and integrated it into the application's model index for use throughout the app. [1] [2] [3]
• Added migration to create the branches table and a follow-up migration to remove the contactNumber column, ensuring the schema matches the API requirements. [1] [2]

Testing:

• Added comprehensive integration tests for all branch endpoints, covering success and error cases for creating, retrieving, updating, and deleting branches.