Add generators for light-ion systems based on EPOS4

[alcaliva]

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[github-actions]

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[alcaliva]

@ddobrigk ,
it looks like we don't have pO for EPOS4. Shall we add it?

[ddobrigk]

@ddobrigk , it looks like we don't have pO for EPOS4. Shall we add it?

Hi Alberto, super thanks! I think it would be useful, though likely the highest priority should probably be pp, OO and Pb-Pb IMHO.