Refactor/blog service

[BerylCAtieno]

Description

Designed and implemented BlogService interface to define service methods.
Developed a concrete implementation of BlogService with business logic for handling blog operations.
Updated the Controller struct to properly inject the BlogService dependency.
Refactored controller methods to use the injected service instead of direct function calls.

Related Issue (Link to Github issue)

This Issue​

How Has This Been Tested?

I run tests on existing tests/test_blog tests in the codebase; they passed
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Screenshots (if appropriate - Postman, etc):

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Types of changes

• Bug fix (non-breaking change which fixes an issue)
• [ x] New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
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Checklist:

• [ x] My code follows the code style of this project.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• [x ] All new and existing tests passed.