logger/log_level library

1. zooper_flutter_logging package
2. documentation
3. logger/log_level.dart

zooper_flutter_logging package

1. Libraries
2. formatter/log_formatter
3. formatter/pretty_formatter
4. logger/log_level
5. logger/logger
6. writer/console_log_writer
7. writer/log_writer
8. writer/sentry_log_writer
9. zooper_flutter_logging