Let user select a version a `runtimeExecutable` path to specific node.js in Node Launch Configuration

WWD needs a NodeJS to run language servers, and also to execute NodeJS launch configurations. Currently, there's not much control over which NodeJS is used. You either have to set org.eclipse.wildwebdeveloper.nodeJSLocation in eclipse.ini or add NodeJS to your PATH. This isn't very flexible, and is problematic because I work on multiple projects that use different versions of NodeJS.

Today, I'm just setting nodeJSLocation and living with the fact that language servers are run with a different NodeJS than the projects are built with. And I'm using JSDT's NodeJS launch config to build the projects, since JSDT allows me to select which NodeJS I want.

It would be nice if WWD provided a workspace-level config option to set which NodeJS to use, and used the specified NodeJS to start language servers and to run NodeJS launch configs.

既存の org.eclipse.wildwebdeveloper.nodeJSLocation 設定、language server の起動、および NodeJS の起動構成を追跡することから始めます。完了条件は、workspace レベルで選択した Node.js が、language server と NodeJS の起動構成の両方で使用され、異なる Node.js バージョンを使用するプロジェクトも対象になることです。