Add span to generated generic variable when desugaring impl Trait function parameters

[michaeljklein]

Aim

The new_generic_type
that's generated when desugaring fn foo(x: impl Trait) lacks a span:

let new_generic_type =
    UnresolvedType { typ: new_generic_type_data.clone(), span: None };

Expected Behavior

The span to be present

Bug

The span of the impl Trait parameter is missing from the generated generic UnresolvedType

To Reproduce

Project Impact

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Impact Context

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Workaround

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Workaround Description

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Additional Context

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Installation Method

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Nargo Version

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NoirJS Version

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