feat: add a PartialOrdSnap impl in the corelib

[tdelabro]

Feature Request

My problem is that +PartialOrd<T> currently doesn't imply +PartialOrd<@T>. Which is inconsistent because it is implied for PartialEq.
The reason being this specific impl:

cairo/corelib/src/traits.cairo

Lines 61 to 65 in 68b7072

	impl PartialEqSnap<T, +PartialEq<T>> of PartialEq<@T> {
	fn eq(lhs: @@T, rhs: @@T) -> bool {
	PartialEq::<T>::eq(*lhs, *rhs)
	}
	}

I think this should be extended to PartialOrd for sure and most likely to other traits in the corelib, like Add and so on.

If the feature request is approved, would you be willing to submit a PR?
(Help can be provided if you need assistance submitting a PR)

No. It is quite simple and will do for a great set of OnlyDust contributions, once the lib owner decides which trait are concerned