Implement Mock for Spheron API Calls for Unit Testing

[faza]

To effectively test our application's interactions with the Spheron platform, we need to develop a mock for Spheron API calls. This will enable us to bypass actual API requests in our tests, making them faster, more reliable, and not dependent on external services.

Acceptance Criteria:

• The mock should simulate all Spheron API endpoints used by our application.
• It must support configuring mock responses to test different response scenarios.
• Integration with our unit testing framework to demonstrate its effectiveness in testing components relying on Spheron API calls.