Implement EGNO

[GiovanniCanali]

Is your feature request related to a problem? Please describe.
Implement Equivariant Graph Neural Operators

[dario-coscia]

@GiovanniCanali this has been open for a while, when do you think we can conclude it?

[GiovanniCanali]

@GiovanniCanali this has been open for a while, when do you think we can conclude it?

Hi @dario-coscia, I think I will manage to close this in approximately 10 days.