Add strided array example

Add an example using conduit::mesh::example::strided_structured(...)

<img width="624" height="38" alt="Image" src="https://github.com/user-attachments/assets/dbbaf303-9e44-4808-a89b-1b0cad6978ec" />

A user is experiencing an issue using strided data: 

<img width="624" height="108" alt="Image" src="https://github.com/user-attachments/assets/f4a28e29-e906-4ba6-a85e-36dc0ed6cd1c" />