feat: Add &T to parser, semantic not implemented yet

[giladchase]

Note: change in attribute_errors are since & can now also be Unary, and the
test wanted to test a missing binary operator, so / is now the binary operator used to keep
the spirit of the test without changing the diff.

[reviewable-StarkWare]

This change is 

[giladchase]

• feat: Add &T to parser, semantic not implemented yet #8577 👈 (View in Graphite)
• main

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[orizi]

@orizi reviewed 7 of 10 files at r1, all commit messages.
Reviewable status: 7 of 10 files reviewed, 1 unresolved discussion (waiting on @TomerStarkware)

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crates/cairo-lang-semantic/src/corelib.rs line 555 at r1 (raw file):

        UnaryOperator::At(_) => unreachable!("@ is not an unary operator."),
        UnaryOperator::Desnap(_) => unreachable!("* is not an unary operator."),
        UnaryOperator::Reference(_) => todo!(),

unreachable as well.

Code quote:

        UnaryOperator::Reference(_) => todo!(),

[giladchase]

Reviewable status: 6 of 10 files reviewed, 1 unresolved discussion (waiting on @orizi and @TomerStarkware)

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crates/cairo-lang-semantic/src/corelib.rs line 555 at r1 (raw file):

Previously, orizi wrote…

unreachable as well.

Done, though what i wrote in the unreachable string will be relevant from the next PR once we add the code that handles it into compute.rs.

[orizi]

@orizi reviewed 3 of 10 files at r1, 1 of 1 files at r2, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @TomerStarkware)