Support type aliases as kinds

[michaeljklein]

Problem

Attempted to compile a program where a numeric generic's kind is a type alias for u32:

pub type SomeAlias = u32;

pub struct Foo<let N: SomeAlias> { }

fn main() { }

Happy Case

Expected the program to compile successfully, but it currently fails with:

error: N has a type of SomeAlias. The only supported numeric generic types are `u1`, `u8`, `u16`, and `u32`.
  ┌─ src/main.nr:3:20
  │
3 │ pub struct Foo<let N: SomeAlias> { }
  │                    - Unsupported numeric generic type
  │

Aborting due to 1 previous error

On version:

nargo version = 0.39.0
noirc version = 0.39.0+df8f2eee5c27d3cd4b6128056afdd9bd4a0322fe
(git version hash: df8f2eee5c27d3cd4b6128056afdd9bd4a0322fe, is dirty: false)

Workaround

None

Workaround Description

No response

Additional Context

No response

Project Impact

Nice-to-have

Blocker Context

No response

Would you like to submit a PR for this Issue?

None

Support Needs

No response