A mental model of how Futures and runtimes work

The main goal in this part is to build a high level mental model of how the different pieces we read about in the previous chapter works together. I hope this will make it easier to understand the high level concepts before we take a deep dive into topics like trait objects and generators in the next few chapters.

This is not the only way to create a model of an async system since we're making assumptions on runtime specifics that can vary a great deal. It's the way I found it easiest to build upon and it's relevant for understanding a lot of real implementations you'll find in the async ecosystem.

Finally, please note that the code itself is "pseudo-rust" due to the need for brevity and clarity.

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