refactor: Standardize naming conventions and improve code consistency

- Renamed functions and variables for consistency, changing `getDatabaseConfig` to `get_database_config`, `createEntities` to `create_entities`, and similar updates across the codebase.
- Updated error handling and logging for better clarity.
- Enhanced the `DatabaseManager` class with improved method names and consistent formatting.
- Refactored the `LibSqlMemoryServer` class to align with new naming conventions and improve readability.
- Ensured all changes maintain existing functionality while improving code maintainability.

Author: spences10