ISSUE #216 Updated campgrounds.js

[Sumanth077s]

📋 Description

This pull request addresses the need for better documentation, code structure, and error handling in the Campground controller. The goal is to enhance readability, maintainability, and overall code quality, making it easier for future developers to work with this module.

🔨 Changes Made

Improved Documentation:

Enhanced JSDoc comments for all exported functions, providing details on parameters, return types, and potential exceptions.
Added a module description at the top of the file explaining the purpose and functionality of the Campground controller.
Refactored Code Structure:

Extracted the average rating calculation into a utility function located in a new utils.js file for better code reusability and adherence to the DRY principle.
Organized related functionalities into separate modules to improve separation of concerns, including a new module for handling geocoding and image processing.
Consistent Error Handling:

Standardized error handling across all methods using ExpressError to provide clearer feedback to users.
Implemented checks for required parameters in createCampground and updateCampground methods to handle potential issues gracefully.
Improved Variable Naming:

Renamed ambiguous variable q in the searchCampgrounds method to query for better clarity and understanding.
Performance Optimizations:

Used .select() in database queries to limit the fields returned, thereby reducing data transfer when unnecessary.

✅ Checklist

Before submitting the PR, please make sure you have completed the following:

• [y ] My code follows the style guidelines of this project.
• [ y] I have performed a self-review of my own code.
• [y ] I have commented my code, particularly in hard-to-understand areas.
• I have made corresponding changes to the documentation (if applicable).
• [y ] My changes generate no new warnings.
• I have tested it locally and it works fine.
• Any dependent changes have been merged and published in downstream modules.

🏷️ Types of Changes

What type of changes does your code introduce? (Check all that apply)

• Bug fix (non-breaking change which fixes an issue) 🐛
• New feature (non-breaking change which adds functionality) ✨
• UI enhancement (non-breaking change which enhances UI) 🎨
• [y ] Documentation update 📚

🤝 Related Issues

• Fixes Refactor Campground Controller for Better Documentation and Code Quality #216

📸 Screenshots (if applicable)

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