ability to set css.enabledLanguages property in "./vscode/setting.json" or in the ".workspace" file

[snicr]

Type: Feature Request / Improvement

it will be nice to be able to set de "css.enabledLanguages" property in the "./vscode/setting.json" or even in the ".workspace" file.
I'm working with devcontainers and it will be ideal to keep all the related configuration in the code repository, currently this configuration kept in the host machine.

[ecmel]

Language ids are registered on extension startup so this may require some refactoring.