Unimplemented steps/scenarios are reported as unknown

**Describe the bug**
Allure-cucumberjs doesn't write the `status` field for unimplemented steps. Such steps are shown as unknown (magenta). If all steps are unimplemented, the whole test is reported as unknown.

**To Reproduce**
Steps to reproduce the behavior:
1. Create the project with a feature file. Don't implement the steps.
2. Run `cucumber-js`.
3. Generate and open the report.

**Expected behavior**
Unimplemented steps and tests should be reported as broken or skipped.

**Screenshots**

**Desktop (please complete the following information):**
- Version 3.0.0-beta.7

Reproduce the issue with a feature file whose steps are unimplemented, then run cucumber-js and inspect the generated Allure report. Trace how the integration assigns statuses to unimplemented steps and scenarios; done means these are reported as broken or skipped instead of unknown.

Written by the indexing model from the issue text.