Introduce multi-slice NuGraph2 inference and filtering

[rtriozzi]

This PR integrates additional NuGraph2 modules in ICARUS, including some that were already introduced in Giuseppe's icaruscode PR #815, on which this PR is based, as well as new modules designed to:

• run NuGraph2 on multiple slices (e.g., those that are tagged as not-clear-cosmic by Pandora), based on work by summer intern Leonardo Lena;
• filter hits from Pandora slices based on the NuGraph2 "filter" score.

Along with the modules, a set of FHiCL files is provided. They are all based on the standard v10_06_00_01p01 configurations. Following the review of this PR, similar FHiCL files based on develop will be provided.

More information on NuGraph2 and its applications can be found in SBN DocDB #40585, #44208, Indico.

A companion PR to sbncode is available for dealing with CAF-making after the NG2 filter module (sbncode PR #616).

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Associated PRs

• Handle CAF making when Pandora runs after the NuGraph2 filter sbncode#616

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Review

Tagging for review @acampani and @PetrilloAtWork as reconstruction and infrastructure experts. Thanks a lot!

[acampani]

After all the fruitful discussions held with @rtriozzi and @cerati which I want to thank, a correction and comments added to help understanding the code, I think this PR is ready to be merged to allow further tests on the impact on the downstream reconstruction but not only.