Add Helium-Oxygen collision systems

[jackal1-66]

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[jackal1-66]

PR linked to AliceO2Group/O2DPG#2025

[ddobrigk]

Super thanks @jackal1-66 ! Then, for using this in actual sim, ould we need to have it as a string option (same as OO but OHe and HeO? I think there, some extra additions would be needed, right?

[sawenzel]

@ddobrigk : Yes, but not via this PR but by the one in O2DPG.