Nucleus registry implementation for extension system.
It is important for such extension to be enabled as soon as possible so that other extensions can use it as a bootstrap to be downloaded. Once enabled it registers itself in the extension manager as extension registry provider.
extension.toml file for settings.
In the provided nucleus URL it stores all extensions as zip archives and special “index.toml” file which contains information about each extension stored.
Omniverse Client library is used under the hood so local filesystem can also be used as a storage.