fix!: better error message when cannot infer generic numeric type

[asterite]

Blocked on noir-bignum getting a new release, then updating dependencies to use this new release.

Blocked on noir-bignum dependencies (and Aztec-Packages, I think) updating to bignum 0.7.0.

Description

Problem

Resolves #7617

Summary

Now this code:

pub fn foo<let N: u32>() -> BoundedVec<Field, N> {
    BoundedVec::new()
}

fn main() {
    let _ = foo();
}

Gives this error:

error: Type annotation needed
  ┌─ src/main.nr:6:13
  │
6 │     let _ = foo();
  │             --- Could not determine the value of the generic argument `N` declared on the function `foo`

I think it's fine that the error shows up there because, for example, one can specify the type of the let variable to fix this (the issue suggested showing the error on BoundedVec::new() instead).

This PR improves a bit how unbound numeric generics are shown in inlay hints.

Before:

After:

Additional Context

I know there's #7889 but this also solves the issue of default_type being wrong for Numeric, and also the fix for #7889 will be a bit different.

Also marked as a breaking change because previously unused numeric generics didn't trigger the error if they were completely unused.

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.

[github-actions]

⚠️ Performance Alert ⚠️

Possible performance regression was detected for benchmark 'Test Suite Duration'.
Benchmark result of this commit is worse than the previous benchmark result exceeding threshold 1.20.

Benchmark suite	Current: bf0834e	Previous: 4ee2d12	Ratio
test_report_AztecProtocol_aztec-packages_noir-projects_noir-protocol-circuits_crates_rollup-lib	223 s	179 s	1.25

This comment was automatically generated by workflow using github-action-benchmark.

CC: @TomAFrench

[asterite]

It seems we'd need to merge #6388 first.

[asterite]

Update:

• Here's a PR to fix Aztec-Packages: fix: remove unused generic and specify some that can't be deduced AztecProtocol/aztec-packages#14277
• Bignum got "broken" again, here's a PR to fix it: fix: remove unused generics noir-bignum#174
• The remaining libraries depend on bignum 0.6.0, which is old by now, and so they fail

I think the path forward would be:

1. Merge the above two PRs
2. Release a new version of bignum
3. Update noir_bigcurve, noir_rsa, noir-jwt and noir_rsa to use the latest version of bignum, and release new versions

Then this PR can be merged.

[asterite]

@TomAFrench I'll also merge this PR if it's okay with you. The libraries that fail to compile with this change are noir-jwt and the two noir-rsa.

[TomAFrench]

LGTM