Add support for implicit tag names

<!-- ⚠️⚠️ Do Not Delete This! feature_request_template ⚠️⚠️ --> <!-- Please read our Rules of Conduct: https://opensource.microsoft.com/codeofconduct/ --> <!-- Please search existing issues to avoid creating duplicates. --> <!-- Describe the feature you'd like. --> Issue Type: *Feature Request* Vscode missing [Implicit tag names](https://docs.emmet.io/abbreviations/implicit-names/#how-it-works) effect, emmet official effect: [](https://docs.emmet.io/abbreviations/implicit-names/#how-it-works) Vscode effect: