fix: Overflowing assignment will result in an error

[Ethan-000]

Description

Problem*

Resolves #2236

Summary*

nargo execute code

use dep::std;
fn main() {
    let x:u8 = 300;
    std::println(x);
}

will result in

error: The literal `300` cannot fit into `u8` which has range `0..=255`

nargo execute code

use dep::std;
fn main() {
    let x:u8 = -1;
    std::println(x);
}

will result in

error: u8 cannot be used in a unary operation

Additional Context

PR Checklist*

• I have tested the changes locally.
• I have formatted the changes with Prettier and/or cargo fmt on default settings.