Add a new "Create a block tutorial"

[ndiego]

Recently, a new Quick Start Guide was added to the Block Editor Handbook (#56056). This guide introduced a "Copyright Date" block that utilizes static and dynamic rendering, block supports, custom attributes, and a custom Settings panel. This block was also intended to form the foundation of a new "Create a block tutorial".

This new tutorial will better represent how blocks can be built today and will also take a more streamlined approach. Instead of a multi-page tutorial, it will be a single page, much like React's tic-tac-toe tutorial. The goal is to improve the onboarding experience for new block developers.

This tutorial will also be closely tied to the work being done in #56282. The tutorial will walk developers through the steps of building the block and reference the "Fundamentals of Block Development" docs for further reading.

[ndiego]

The new "Tutorial: Build your first block" is drafted here in Google Docs. Before creating a PR, this tutorial needs to be thoroughly tested and edited. Please add notes here or directly in the doc itself. Thanks!

https://docs.google.com/document/d/15n3KrFCd8sZmy2DOjk3Vf-UABIOZ7kwBhO_HjyXzYvE/edit