[FLUTTER] - Logging in Core Models (Part 2)

[Yash159357]

Prerequisites

• I have searched existing issues and discussions
• This feature doesn't already exist in the app
• This feature aligns with the app's purpose and goals

Feature Summary

Description: Adding logs to the specified model files to track data parsing and object creation.
Files:
• lib/models/news_category.dart
• lib/models/theme_model.dart
• lib/models/user_model.dart
Guidelines:
• Log when a model object is created or deserialized from a JSON response.
• Log any parsing errors.
• Log format: <FILE_NAME_IN_ALL_CAPS>

Acceptance Criteria

No response