Example proposal: Custom operator to create GLTF files

[PProfizi]

📝 Description of the example

Example proposal: Custom operator to create GLTF files

This example specifically shows how to export scenes to GLTF by calling the pyvista GLTF export (see here) in a custom Python operator with dependency on pyvista.
This operator can thus take in a series of DPF objects, instantiate a Plotter, add the objects to the scene, and then export to GLTF.

📁 Files needed for running the example

Use available example file such as the static mixer.