gh-35463: Add iterator over minimum distance k dominating sets
Fixes #35461 (second part).
### :books: Description
This PR adds an iterator over the **minimum** distance-k dominating
sets. This is different than PR #35462 which enables to iterate over the
**minimal** distance-k dominating sets.
### :memo: Checklist
<!-- Put an `x` in all the boxes that apply. It should be `[x]` not `[x
]`. -->
- [x] The title is concise, informative, and self-explanatory.
- [x] The description explains in detail what this PR is about.
- [x] I have linked a relevant issue or discussion.
- [x] I have created tests covering the changes.
- [x] I have updated the documentation accordingly.
### :hourglass: Dependencies
None.
URL: https://github.com/sagemath/sage/pull/35463
Reported by: David Coudert
Reviewer(s): Travis Scrimshaw
