feat: PartialEq for 2,3,4-tuples

[milancermak]

PR adds support for PartialEq for tuples of 2, 3 and 4 elements.

There are other impls for tuples of sizes up to 4, but PartialEq is missing.

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This change is 

[orizi]

Reviewable status: 0 of 1 files reviewed, 1 unresolved discussion (waiting on @milancermak)

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corelib/src/traits.cairo line 242 at r1 (raw file):

        let (lhs0, lhs1) = lhs;
        let (rhs0, rhs1) = rhs;
        (lhs0 == rhs0) && (lhs1 == rhs1)

also the others.

Suggestion:

        lhs0 == rhs0 && lhs1 == rhs1

[milancermak]

Reviewable status: 0 of 1 files reviewed, 1 unresolved discussion (waiting on @orizi)

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corelib/src/traits.cairo line 242 at r1 (raw file):

Previously, orizi wrote…

also the others.

Done.

[orizi]

Reviewed 1 of 1 files at r2, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @milancermak)

[orizi]

Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @milancermak)

a discussion (no related file):
@gilbens-starkware for 2nd eye.

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[gilbens-starkware]

Reviewed all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @milancermak)