Create devcontainer.json to enable GitHub CodeSpaces

[yvan-sraka]

Description

Add VSCode DevContainer / GitHub CodeSpaces configuration to the project.

Checklist

• Commit sequence broadly makes sense and commits have useful messages
• New tests are added if needed and existing tests are updated. These may include:
  • golden tests
  • property tests
  • roundtrip tests
  • integration tests
    See Runnings tests for more details
• Any changes are noted in the CHANGELOG.md for affected package
• The version bounds in .cabal files are updated
• CI passes. See note on CI. The following CI checks are required:
  • Code is linted with hlint. See .github/workflows/check-hlint.yml to get the hlint version
  • Code is formatted with stylish-haskell. See .github/workflows/stylish-haskell.yml to get the stylish-haskell version
  • Code builds on Linux, MacOS and Windows for ghc-8.10.7 and ghc-9.2.7
• Self-reviewed the diff

[github-actions]

This PR is stale because it has been open 45 days with no activity.

[github-actions]

This PR is stale because it has been open 45 days with no activity.

[github-actions]

This issue was closed because it has been stalled for 60 days with no activity.