Add DevContainer

[rafaelstz]

It creates a devcontainer configuration to enable developers to establish a proper setup from the outset using GitHub CodeSpaces.

[mor10]

@rafaelstz FYI you don't need to load the specialized TypeScript container or all the Python features. The default container has full Python and TypeScript support out of the box. Also, since this setup is bare-bones, you can simplify it by running the setup commands in the devcontainer file itself. That way the user doesn't need to wait for Docker to spin up.

[rafaelstz]

Hey @mor10 all set. I just had to install pnpm, but I removed the extra Python features to minimize the build time.