Data visualization of glTF ecosystem

To help understand the ecosystem and to create some fun social media content, it would be interesting to do some D3-like data visualizations with the content in glTF Project Explorer, e.g., map of what programming languages are used; export vs. import tools; web vs. desktop; etc.

For inspiration, see the [D3 graphics gallery](https://www.d3-graph-gallery.com/). I've also seen this type of taxonomy done on GitHub projects.

No file, test, or entry point is named. Start by reviewing the glTF Project Explorer content and the linked D3 graphics gallery, then define which visualizations and data fields are in scope; done would require an agreed set of working ecosystem visualizations.

Written by the indexing model from the issue text.