wordpress-playground-block: Load code from external sources (repo and folders in repo)

[juanmaguitar]

For wordpress-playground-block it would be great to enable the following feature: Being able to load code from an external repository, including loading code from a folder of a repository

For example, in the Block Editor Handbook, we're showing snippets and providing links to the source of this code in a way that this code can be cloned, tested and seen in action in a live WordPress instance

Example:

• https://developer.wordpress.org/block-editor/getting-started/fundamentals/block-json/#using-block-supports-to-enable-settings-and-styles
• https://developer.wordpress.org/block-editor/getting-started/fundamentals/block-json/#reading-and-updating-attributes

The examples shown in the Block Editor Handbook come from https://github.com/WordPress/block-development-examples

cc: @adamziel

[juanmaguitar]

Closed as per https://github.com/WordPress/playground-tools/pull/282