[VS Code]Add an option to generate only routes from an OpenAPI

[hguerrero]

Environment

• Karavan version: 0.0.15
• Platform: Mac

Current behavior Currently options are generate REST Only or REST and Routes

Expected/desired behavior Add an option to generate only routes

Minimal reproduction of the problem with instructions Generate a simple OpenAPI, right click on it.

• Others: This is because we want to pass the openapi file to the execution of the routes from a service registry, so that is always getting the latest version, no need to update the details of the rest configuration.