Add dev containers for easier dev environments

[luizirber]

After #4 is merged, work on adding dev container so gitpod or github codespaces can serve as development platform (without needing to set up a local docker compose stack)

Links:
https://docs.github.com/en/codespaces/setting-up-your-project-for-codespaces/adding-a-dev-container-configuration/introduction-to-dev-containers
https://docs.github.com/en/codespaces/developing-in-a-codespace/creating-a-codespace-for-a-repository#creating-a-codespace-for-a-repository
https://containers.dev/templates
https://github.com/devcontainers/templates/blob/main/src/rust/.devcontainer/devcontainer.json