Update PyTorch and PyTorch lightning

[vitusbenson]

The current package is moreless based on PyTorch lightning 1.2.x and PyTorch 1.7.x (backward compatible to 1.5.x), however current version for Lightning is 1.7.7 and for PyTorch 1.12.1.

Goal:

• Update to latest versions
• Figure out, what code needs to be changed
• Implement backward compatibility where necessary
• Check for new features in the new versions that could be additionally implemented

[vitusbenson]

Could also switch to Lightnings new command line interface and new config yaml API (both were not there when emp was done):
https://pytorch-lightning.readthedocs.io/en/stable/cli/lightning_cli_intermediate.html#connect-a-model-to-the-cli
https://pytorch-lightning.readthedocs.io/en/stable/cli/lightning_cli_advanced.html#run-from-a-single-yaml

[vitusbenson]

torchmetrics changed API in 0.8.0, which deprecates compute_on_step and changes the overall logic. This will require some refactoring.