Create images for illustrating the structure and workflow

## Description

The Python SDK has documentation, and that is a good starting point for accommodating,
but having some images that show details would help in better understanding the sdk.
For instance, there can be an image illustrating the inner structure of the sdk, a graph with
the classes and the relations between them, or the workflows of different operations:
applying a manifest, creating a workload etc.

Example from Ankaios:
https://github.com/eclipse-ankaios/ankaios/tree/main/api/doc/swdesign/drawio

## Goals

Images are created that illustrate how the SDK works.

## Final result

### Summary

**To be filled when the final solution is sketched.**

### Tasks

- [ ] Analize what can be illustrated.
- [ ] Find a way to programmatically create the diagrams (see example from main repo).
- [ ] Generate the images.
- [ ] Optional: Add the images to the documentation and readme.

Start by reviewing the Python SDK documentation and the Ankaios drawio example linked in the issue. Discuss and agree on the use cases and diagrams with committers, then choose a way to generate them; done means the SDK structure and workflows are illustrated, with optional integration into the documentation and README.

Written by the indexing model from the issue text.