Supports automatic calling of APIs conforming to the OpenAPI specification.

[yiyiyi0817]

Description

This PR introduces a significant feature enhancement to the CAMEL project by enabling automatic calling of APIs that comply with the OpenAPI Specification (OAS). This update adds support for Klarna, Coursera, and Speak APIs, broadening the scope of external integrations available within the CAMEL ecosystem.

To facilitate these integrations, the project now includes a generic function that dynamically handles requests to any API defined by an OpenAPI spec. This means contributors can easily extend the project's capabilities by integrating with various services that expose their APIs with an OpenAPI document.

Motivation and Context

The OpenAPI Specification offers a widely adopted standard for describing RESTful APIs, making it easier to integrate disparate systems.

Types of changes

• [x] New feature (non-breaking change which adds core functionality)
• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)
• [ ] Documentation (update in the documentation)
• [x] Example (update in the folder of example)

Implemented Tasks

• [x] Generic OpenAPI Integration Function: A new utility function has been introduced, capable of dynamically generating requests to APIs based on their OpenAPI specifications, along with schemas required by OpenAI. Please note, the current version does not support APIs requiring security authentication.

• [x] Klarna API Integration: Implemented integration with Klarna's payment API, enabling users to search goods.

• [x] Coursera API Integration: Added support for accessing Coursera's educational content API, allowing users to retrieve course information, enrollments, and other educational resources.

• [x] Speak API Integration: Incorporated the Speak API for advanced natural language processing, offering capabilities such as translation, language explaination.

Checklist

Go over all the following points, and put an x in all the boxes that apply.

• [x] I have read the CONTRIBUTION guide. (required)
• [ ] My change requires a change to the documentation.
• [x] I have updated the tests accordingly. (required for a bug fix or a new feature)
• [ ] I have updated the documentation accordingly.

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[Wendong-Fan]

Hey @yiyiyi0817 , thanks for your reply, please feel free to update the code based on our discussion above, then it LGTM!