CodeLens - Show Actionable Context Information Within Source Code
#CodeLens
https://code.visualstudio.com/api/language-extensions/programmatic-language-features#codelens-show-actionable-context-information-within-source-code
Provide the user with actionable, contextual information that is displayed interspersed with the source code.
language server protocolによる実装
直接実装
vscode.CodeLensProviderを実装（CodeLensProvider (VS Code API)）
👉ドキュメントを編集する拡張機能のコード解説
Define the CodeLens results that are available for a document.
Bind the CodeLens results to a command by responding to codeLens/resolve.
拡張実装例ではやっていそう
LSPの話？