Visualization of the square-pythno-sdk

I understand that this PR won't get merged. I usually would open a discussion on github, but since I don't need support and do not have really a feature request decided to open one. You can close it as soon as you feel like doing so.

This PR introduces high-level graph documentation for the sqyare-python-sdk. You can see how it renders here: https://github.com/CodeBoarding/GeneratedOnBoardings/blob/main/square-python-sdk/on_boarding.md

The goal of such diagram driven documentation is to help people get up-to-speed with new codebases. I would love to hear what is your current process when someone engages with your teams source code. We believe high-level understanding is crucial and just after that one can dive deeper into the interesting component. That is why we generate our diagrams in such fashion. For the generation we leverage Static Analysis and LLMs, and currently we are looking into creating a github actions so that people can generate these diagrams on demand.

Any feedback is more than welcome!

Full disclosure: we're trying to turn this into a startup, but we're still in a very early stage and figuring out what will actually be useful for people.

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