Add a notebook that replicates the setup and results of the benchmark 7 of Jean-Francois Aubry et al paper

[d-lucena]

Describe the new feature or enhancement

A notebook that describes how to replicate the results as those in the benchmark 8 using NDK

Describe your proposed implementation

Show how to setup the scenario, setup material properties, transducer position and properties, and run the simulation that replicates the results in Jean-Francois Aubry, et al..
The results from NDK and from the paper are then presented together to show they match.

[charlesbmi]

Because of how long benchmark 4 already takes to run (and benchmark 8 is longer), we are just going to run this benchmark in 2D.

Another option would be to run this with benchmark 7, which is a smaller subregion of benchmark 8

[charlesbmi]

Based on offline discussion, we are going to change this to benchmark 7, which fits on a GPU at PPW=6 PPW=24