make bevy_utils::DebugName public outside of prelude (#23641)

[Arne-Berner]

Objective

Fixes #23641

Solution

To stay consistent to the provided API by bevy_utils I only made DebugName public instead of debug_info.

Testing

I was able to call DebugName from outside like this:

use bevy_utils::DebugName;

struct Foo();

fn main() {
    let name = DebugName::type_name::<Foo>();
    println!("{name}");
}

This is a simple change that should be platform independent.

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[andriyDev]

Ah nice! Yeah only exposing from prelude is goofy.