More selection options for exporting mesh

### 📝 Description of the feature

Using the export_mapdl_cdb I am missing an option to select a part or topoface for the export, instead of only being able to export the full model.

### 💡 Steps for implementing the feature

in the file_io.export_mapdl_cdb I wold like an option for selecting a specific part.id and topoface similar to the possibilities available in surfer.mesh_topo_faces(part.id, topo_faces=part.get_topo_faces(), params=surfer_params)

### 🔗 Useful links and references

_No response_

Start by reading file_io.export_mapdl_cdb to understand its current full-model export flow. Compare its selection behavior with surfer.mesh_topo_faces(part.id, topo_faces=part.get_topo_faces(), params=surfer_params). Done means the export can target a selected part.id or topoface instead of only the full model.

Written by the indexing model from the issue text.