Feature Request: Vertical Display of Editor Area Texts (Vertical Texts)

<!-- ⚠️⚠️ 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. --> Some programming language prefer to display texts vertically, especially Asian programming languages, e.g. [wenyan](https://github.com/wenyan-lang/wenyan). And several IDEs support vertical editing, (see [here](https://github.com/wenyan-lang/wenyan/issues/9#issuecomment-567318062)). It would be nice for VSCode to support vertical editing. A prototype implementation would be adding the following css to the Editor Area as suggested [here](https://github.com/wenyan-lang/wenyan/issues/9#issuecomment-568175009) ``` writing-mode: vertical-rl; text-orientation: upright; ``` Visual effect of displaying vertical texts: <img width="772" alt="image" src="https://user-images.githubusercontent.com/9295852/173471954-d40d5d92-7d0c-4e07-ac66-a065d53f0d63.png"> c.f. https://github.com/wenyan-lang/wenyan/issues/9