Deprecation List for GraphNeT 2.0

Created by: RasmusOrsoe

This thread tracks the items marked for deprecation for the release of GraphNeT 2.0.

• - ´gnn´ argument in StandardModel. See #646
• - call to rename_state_dict_entries in Model.load_state_dict
• - save_model_config and save_dataset_config decorators. See #591
• - delete graphnet.data.parquet and graphnet.data.sqlite See #659