Sweep: Create endpoint for getting books by category

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  Description

  This pull request introduces a new endpoint /books/category/:categoryName for fetching books by their category. It also sets up testing for this new feature using Jest and Supertest, ensuring the endpoint behaves as expected under various scenarios.

Summary

• Added jest and supertest to package.json for testing purposes.
• Created a new test file tests/books.test.js to cover the new endpoint functionality.
  • Tests include checking for a successful response with an array of books for existing categories.
  • Tests for receiving a 404 status code and an appropriate error message when querying non-existent or invalid categories.
• Ensured the database connection is properly set up and torn down before and after tests using mongoose.

Fixes #63.

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Rollback Files For Sweep

• [ ] Rollback changes to tests/books.test.js
• [ ] Rollback changes to package.json

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Apply Sweep Rules to your PR?

• [ ] Apply: All docstrings and comments should be up to date.
• [ ] Apply: All new business logic should have corresponding unit tests.
• [ ] Apply: Refactor large functions to be more modular.
• [ ] Apply: Add docstrings to all functions and file headers.

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