Services in unopened projects

Some language services, such as findAllReferences, rename, navigateTo, and getEditsForFileRename, as well as refactors like moveToNewFile (which wants to update imports from external references), work best when they know about as many files as possible.
Currently we only keep projects open if at least one file is being viewed in the editor.
When we invoke a service that might need to know about unopened projects, we might consider walking up ancestor directories to look for a base tsconfig.json that references many projects, and opening those.

Issue に記載されている language services から始め、現在プロジェクトがエディター ファイルの表示時にのみ開いた状態に保たれている仕組みを追跡します。次に、base tsconfig.json を探すための祖先ディレクトリの検出を調べ、services とリファクタリングが関連する未開封のプロジェクトを使用できるように動作を定義します。