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).

まず、現在ハードコードされている Create Java Project のタイプ一覧を見つけ、package.json が拡張機能のメタデータにどのように寄与しているかを確認します。拡張機能 ID、ラベル、コマンド ID、オプションの引数の contribution data を定義し、別の拡張機能がプロジェクトタイプを提供できることと、Create Project の一覧からそれが正しく呼び出されることを確認します。