Light Calorimetry: add SRLightCalo and SRTrueDeposit classes

[lynnt20]

Quick checklist

• Have you run git fetch and pulled the latest changes from the branch you're basing your PR against?
• If you're adding new classes, have you added them to classes_def.xml in the relevant directory?
• Have you added a checksum in classes_def.xml to any and all new classes you're implementing, and rebuilt?
• If you're updating classes, have you incremented the ClassVersion by one compared to develop in classes_def.xml?

Description

SRTRueDeposit

SBND is currently keeping SimEnergyDeposits throughout the workflow. We can take better advantage of this information (truth level number of electrons, photons, and true energy deposits for true neutrino interactions) by adding it to the cafs. Default will be empty if no SimEnergyDeposits are available in the input files. Only adds 3 floats per neutrino interaction (obtained from length of MCTruth).

SRLightCalo

Class to fill reconstructed number of electrons, photons, and energy deposits.

Accompanying PRs: SBNSoftware/sbndcode#878, SBNSoftware/sbncode#619, SBNSoftware/sbnobj#158

[kjplows]

@lynnt20 could you nominate reviewers please?