Add a deno dev container / codespaces

[justinmchase]

Seems like using this will work:
https://github.com/chriskevin/devcontainer-typescript-deno

More docs:
https://docs.github.com/en/codespaces/setting-up-your-project-for-codespaces/introduction-to-dev-containers#devcontainerjson

Then enable in the project settings.