[Feature Request] Signed/Unsigned integers

[skyleriscoding]

At the moment, Vale only has support for signed integers. It would be highly beneficial the addition of unsigned ones.
I propose making integers unsigned by default. Most of the times negative numbers aren't needed, and they can be source of bugs.
To make integers signed, an explicit sign is required before the literal.

unsigned u32 = 3
signed i32 = +3