Improve unused struct warning

[asterite]

Problem

Right now the unused struct warning will not trigger if the struct has some impls:

struct Foo {} // No warning here
impl Foo {}

Happy Case

The above code warns that Foo is unused.

Checking what Rust does, it says that Foo is never constructed. So I'm think that in the case of structs, we don't need to check if they are referenced: we need to check if they are constructed. If not, then they are unused.

Workaround

None

Workaround Description

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Additional Context

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Project Impact

None

Blocker Context

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