Added new method to Cone 3D primitive (#14325)

Reference to #14299.

# Objective
- Ensuring consistent practice of instantiating 3D primitive shapes in
Bevy.

## Solution

- Add `new` method, containing `radius` and `height` arguments, to Cone
3D primitive shape.

## Testing

- Instantiated cone using same values (radius is `2.` and height is
`5.`), using the current method and the added `new` method.
- Basic setup of Bevy Default Plugins and `3DCameraBundle`.


---

## Showcase

<details>
  <summary>Click to view showcase</summary>

```rust
use bevy::prelude::*;

fn main() {
    App::new()
        .add_plugins(DefaultPlugins)
        .add_systems(Startup, setup)
        .run();
}

fn setup(
    mut commands: Commands,
    mut meshes: ResMut<Assets<Mesh>>,
    mut materials: ResMut<Assets<StandardMaterial>>,
) {
    let new_cone = meshes.add(Cone::new(2., 5.));
    commands.spawn(PbrBundle {
        mesh: new_cone,
        ..default()
    });

    let old_cone = meshes.add(Cone {
        radius: 2.,
        height: 5.,
    });
    commands.spawn(PbrBundle {
        mesh: old_cone,
        material: materials.add(Color::WHITE),
        transform: Transform::from_xyz(10., 0., 0.),
        ..default()
    });

    commands.spawn(Camera3dBundle {
        transform: Transform::from_xyz(20., 20., 20.).looking_at(Vec3::ZERO, Dir3::Y),
        ..default()
    });
}
```

</details>


![image](https://github.com/user-attachments/assets/267f8124-8734-4c20-8840-fcf35375a778)


- Pink Cone is created using the `new` method.
- Black Cone is created using the existing method.

## Migration Guide
- Addition of `new` method to the 3D primitive Cone struct.

crates/bevy_math/src/primitives/dim3.rs

@@ -625,6 +625,10 @@ impl Default for Cone {
 }
 
 impl Cone {
+    /// Create a new [`Cone`] from a radius and height.
+    pub fn new(radius: f32, height: f32) -> Self {
+        Self { radius, height }
+    }
     /// Get the base of the cone as a [`Circle`]
     #[inline(always)]
     pub fn base(&self) -> Circle {