feat: (try) Support u384 numeric literals

[feltroidprime]

u384 takes 4-5 lines to write as constant or in tests, so this would improve a lot readability and dev experience

Currently i've added

• the trait implementation in cairo in circuits.cairo
• a simple test in circuit_test.cairo
• a branch in the function validate_literal in crates/cairo-lang-semantic/src/corelib.rs for the type
• a branch in the function value_as_const_value in crates/cairo-lang-semantic/src/items/constant.rs to split the limbs for the type

However when running ./scripts/cairo_test.sh the issue is that get_core_ty_by_name(db, "u384".into(), vec![]) says that u384 doesn't exist (Unknown type)

Would appreciate some help from this point. Thank you!

This change is 

[orizi]

Reviewable status: 0 of 4 files reviewed, 1 unresolved discussion (waiting on @feltroidprime)

a discussion (no related file):
i don't think we should - u384 is a special type for circuits - i don't think people should really use it out of the circuits scope.
having a literal for it makes it "overly friendly"

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