Implement a ConfigValidator class that wraps voluptuous.Schema to validate application configuration…

Implement a ConfigValidator class that wraps voluptuous.Schema to validate application configuration…: a task in r2e-code-instruct-qwen3.5 (Harbor dataset). Example Input: {'app name': 'myapp', 'version': '1.0'} Expected Output: Returns {'app name': 'myapp', 'version': '1.0'}