add `lstat` to `Node.FS.Aff`

[artemisSystem]

Description of the change

add lstat to the Aff module, as it was missing.

---

Checklist:

• [x] Added the change to the changelog's "Unreleased" section with a reference to this PR (e.g. "- Made a change (#0000)")
• [] Linked any existing issues or proposals that this pull request should close
• [] Updated or added relevant documentation
• [] Added a test for the contribution (if applicable)