utils/exit library

1. olx_test_runner package
2. documentation
3. utils/exit.dart

olx_test_runner package

1. Libraries
2. command_runner/command_runner
3. command_runner/test_group_generator_command
4. command_runner/test_runner_command
5. command_runner/validate_test_command
6. test_group_generator/test_group_generator
7. test_runner/error_event
8. test_runner/event
9. test_runner/event_type
10. test_runner/group_event
11. test_runner/test_event
12. test_runner/test_progress
13. test_runner/test_result
14. test_runner/test_runner
15. test_validator/test_validator
16. test_validator/validation_result
17. test_validator/validation_summary
18. utils/cli_logger
19. utils/exit
20. utils/input_utils