adding jet features to LeptonTaggers evaluation

This MR adds a first (ugly) evaluation of jet features for PLIT networks.

Done:

• Implement lepton features
• Implement track features (sort tracks by dR to the lepton and take the first 40 tracks around the lepton, ensuring they pass track selection).
• Split the inference of electrons into end-cap and barrel sections.
• Clean up static accessors to make the algorithm thread-safe.

In the long run, a more modular approach with track loaders and custom getter utils like in flavour tagging should be adopted.