feat: add extension to setup fqdn for windows virtual machines

[irinelbogdansp]

What changed

Release impact

A merge that touches src/ publishes a version. There is no staging branch between this pull
request and a consumer's terraform init. Docs- and CI-only changes do not release; they ride out
with the next module change. Pick one:

• Additive — a new module, a new optional input with a default. Title it feat:; ships as a
  minor.
• Internal or corrective — a fix, a refactor, docs, CI, a dependency bump. Ships as a patch.
• Breaking — renamed or removed an input or output, changed a default, changed a resource
  address, or tightened validation that previously accepted a working value. Still ships as a
  minor or a patch; majors are cut deliberately, not inferred.

⚠️ A breaking change does not bump the major here, so the release notes are the only place a
consumer will see it. Put BREAKING CHANGE: on its own line in a commit footer — the squashed body
keeps every commit message, so the footer survives wherever the subject came from. A ! is only
matched in the subject itself: the commit subject on a single-commit branch, the pull request title
when there are two or more. Unmarked, the break is invisible.

Checks run locally

• terraform fmt -recursive
• python .github/scripts/check-docs.py
• terraform init -backend=false && terraform validate in each module touched
• New module: added to the family guide in
  docs/modules/ and all five
  counts updated — see
  adding a module

Anything reviewers should look at twice