load dotenv files inside the currently open folder

[mainrs]

.env files can be used to configure environment variables for a project. A lot of tools respect these. It would be great if the extension could set them before starting the LSP server. That way constructs like these are easier to work with:

let Types = env:PROJECT_DEVELOPMENT ? https://.../Types.dhall

Would be great if the LSP gets restarted once the .env file changes.