- Replace LogLevel enum with a dedicated class that encapsulates
log level representation.
- Add factory methods for creating Debug, Info, and Error levels.
- Add string conversion support through LogLevel::toString().
- Add equality comparison operators for LogLevel instances.
- Rename Logger::writeLog() to writeMessage().
- Add writeMessage() overload that uses the default log level.
- Implement actual file writing with error handling using core::Status.
- Improve logger documentation to reflect the updated API.
- Update logger tests to use the new LogLevel API.
- Move logger tests into the core test directory.
- Replace enum-based log level usage with LogLevel factory methods.
- Update test cases for the renamed writeMessage() method.
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