User management endpoints for Crisis Cleanup.

This ViewSet provides comprehensive user management functionality including:

• User profile retrieval and updates
• Current user information access
• Beta feature management
• User state management
• User orphaning operations

Authentication: Most operations require authentication. List and retrieve operations are publicly accessible with limited data.

Permissions: Users can typically only update their own profiles unless they have administrative permissions.

Filtering: Users can be filtered by various fields including organization, roles, and other attributes using query parameters.