OpenAPI Support | Document the OpenAPI Module

[iskitsas]

Parent issue: #72

Create comprehensive documentation for the new OpenAPI module, including installation, usage, and examples.

Tasks:

• Write documentation for the OpenAPI module.
• Include examples of generated cURL commands and .flex scenarios.
• Provide troubleshooting tips and best practices.
• Include documentation in github page https://flexivian.github.io/flexbench/ (using docusaurus)