chore: add a .devcontainer.json file with rust support

[TomAFrench]

Description

Problem*

Resolves

Summary*

I've been using a github codespace to review some PRs from external contributors recently. One issue I've been running into is that the default codespace image doesn't have rust installed so I need to install it each time.

This PR sets the codespace to use an image which installs rust by default to avoid this step.

Relevant links:
https://docs.github.com/en/codespaces/setting-up-your-project-for-codespaces/adding-a-dev-container-configuration/introduction-to-dev-containers#about-dev-containers

Documentation

• This PR requires documentation updates when merged.

  • I will submit a noir-lang/docs PR.
  • I will request for and support Dev Rel's help in documenting this PR.

Additional Context

PR Checklist*

• I have tested the changes locally.
• I have formatted the changes with Prettier and/or cargo fmt on default settings.

[TomAFrench]

This image doesn't have yarn, etc. by default so this needs to be added.

[kobyhallx]

This was previously attempted this way:
feat: nix based devncontainer #3097

let's discuss which would be most universal?

[TomAFrench]

Closing in favour of #3097