Adding devcontainer to Venia Concept

[rafaelstz]

Many devs in my team and community report issues installing PWA Studio in their local environments. The issues are mainly related to DNS, Node or Yarn version, ports in use, etc.
Adding devcontainer to Venia Concept will make it much easier to start developing after yarn create @magento/pwa.

It has Node 18 LTS and a small Nodejs Docker image made exclusively for VSCode and CodeSpace.

The next step would be adding guidance on DevDocs. I will do it when the PR is merged.

[pwa-studio-bot]

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