fix(frontend)!: Restrict numeric generic types to unsigned ints up to u32

[vezenovm]

Description

Problem*

Resolves #5571

The issue references expanding the supported type-level integers, however, after a team discussion we decided to simply restrict the supported numeric generics. If other kinds of numeric generics become highly requested we can then re-assess whether we want to expand support for type level constants.

Summary*

A new parser combinator for numeric generics was introduced to differentiate with the existing type_expression combinator. This is due to usage of or_not in the generic_type_args parser. Due to the or_not combinator the expression error was being ignored. Thus, the new numeric generic expression combinator returns an optional expression along with its parsed type.

Additional Context

This program:

    fn big<let N: u64>() -> u64 {
        N
    }

    fn main() {
        let _ = big::<18446744073709551615>();
    }

gives the following error:

The previous errors were very unclear:

Documentation*

Check one:

• No documentation needed.
• Documentation included in this PR.
• [For Experimental Features] Documentation to be submitted in a separate PR.

PR Checklist*

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

[jfecher]

Looks like numeric_generic_used_in_trait needs to be updated

[jfecher]

👍