Extensible "Create Project" project type list

I have a request similar to #713, but more generic: that the Create Project list of project types could be extensible - and other extensions could contribute to it. Adding explicitly project types with their extension IDs and commands centrally into vscode-java-dependency does not scale well, as many extensions that support a certain technology could offer preconfigured java project templates, or "wizards" to create boilerplate projects.
In the long run, opening integration in the Create Java Project can offer a smooth user experience.

The same data as with the current hardcoded list could be contributed through package.json by other extensions: extension ID, label and command ID, and the Java Dependency extension would then define argument(s) that will be passed to the creation command (if any).

Beginne damit, die aktuelle fest codierte Typenliste für Create Java Project zu finden und zu prüfen, wie package.json Metadaten zu Erweiterungen beiträgt. Definiere die Beitragsdaten für Erweiterungs-ID, Label, Command-ID und optionale Argumente. Überprüfe anschließend, dass eine andere Erweiterung einen Projekttyp bereitstellen kann und dass die Liste Create Project ihn korrekt aufruft.