Create rake task to generate and save OpenAPI 3.0 specification

Create Rake Task for OpenAPI Specification Generation

Description

We need to create a rake task that automates the generation of our OpenAPI specification documentation. This task should run the new OpenAPI 3.0 generator and save the output to a standardized location.

Requirements

• Create a new rake task that executes the existing OpenAPI generator
• Save the generated output to doc/api/openapi/openapi_v3.yaml
• Ensure the task integrates smoothly with our current development workflow