Port topomodelx/transforms (dev branch) to toponetx

[ninamiolane]

What?

Put code that lifts a complex (such as a simplicial complex) into another (such as a cellular complex) into toponetx.

• Integrate the file graph_to_simplicial_complex.py
• Integrate the file mesh_to_simplicial_complex.py
• Integrate the file to_hypergraph.py
• Integrate the file to_simplicial_complex.py

This code is currently in topomodelx/transforms (dev branch) here.

Why?

Because the lift operation can be used outside of the deep learning context.
Thus, it should be removed from topomodelx and included in toponetx.

Where?

Into a folder TopoNetX/toponetx/lift and files:

• to_hypergraph.py
• etc

With a corresponding folder of tests in TopoNetX/test/lift and files:

• test_to_hypergraph.py
• etc

How?

Only integrate a new function into toponetx if it comes with its corresponding test function.