snapshot of development before merging with dev branch 
this branch has been used to create public result plots of QAT with Brevitas and iterative pruning tested on the metric learning MLP.

https://cds.cern.ch/record/2888383

Add HGNN and CC_and_removal_junction models for track reconstruction stage.

This version allows Acorn to run with the following versions of the environment packages:

- torch: 2.1.x
- pytorch_lightning: 2.1.x
- pyg: 2.4.x
- cuda: 12.x
- cugraph: 23.12.x
- torch_scatter: 2.1.x

The code remains compatible with previous versions (torch 1.x, etc).

version 0.1