Add an Editor Script to make Interactive Defold tutorial

Idea is to use Editor Scripts and UI to display interactive tutorials in Defold - it should be invoked in the "Tutorials" that can be run from Defold Editor. The script could e.g. parse the markdown readme in order to display the steps.

Editor Scripts now support images, only left thing is to allow interactivity while Editor UI is opened:

https://github.com/defold/defold/issues/11671

Start by reading the issue's proposal for an Editor Script and the existing Tutorials that can be run from the Defold Editor. Review the referenced issue #11671 to understand the remaining interactivity limitation, then determine whether the markdown README parsing and interactive UI are feasible. Done means an interactive tutorial can be invoked from Tutorials and display its steps.

Written by the indexing model from the issue text.