imp: support .envrc

[JaeAeich]

Most project will have .env file and users might opt source these env, it would be more efficient to not rely on dev to source these env variable, rather automate it. This will also help making the setup more reproducible as we could configure the project on an environment level without affecting anyone's local setup. Automatic exporting and removing these env variable can be done using .envrc file and plugin like direnv.