gh-36604: Calculation of Maximum Leaf Number graph parameter
Added function to calculate the Max Leaf Number graph parameter.
Fixes #36603
- [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.
URL: https://github.com/sagemath/sage/pull/36604
Reported by: Jared Smith
Reviewer(s): DaveWitteMorris, David Coudert
