fix: properly account for sign in pg to/from sql implementation for signed

[luzzif]

Motivation

The FromSql/ToSql implementations for the Signed type didn't properly account for signs when dealing with the NUMERIC type. This PR addresses it. Check out the screenshot below for an example.

[DaniPopes]

Thanks!

[luzzif]

Any idea when we could see this integrated in the alloy Rust crate? Or alternatively, could you tell me how I can locally use this?

[DaniPopes]

You can patch alloy-primitives in your workspace manifest until a new release is made: https://doc.rust-lang.org/cargo/reference/overriding-dependencies.html

[DaniPopes]

This is now released in 0.8.8.