Rhombus sampling (#20082)

# Objective

- Implement `ShapeSample for Rhombus`

## Testing

- The results can be verified visually. 

---

## Showcase
### Boundary
<img width="855" height="545" alt="image"
src="https://github.com/user-attachments/assets/0cdb16a8-f26a-4f13-a5dc-dd27e251a6d0"
/>

### Interior
<img width="736" height="512" alt="Screenshot 2025-07-11 143336"
src="https://github.com/user-attachments/assets/1ba6b2af-4d89-485a-9256-f02b4e2043a7"
/>

crates/bevy_math/src/sampling/shape_sampling.rs

@@ -224,6 +224,26 @@ impl ShapeSample for Annulus {
     }
 }
 
+impl ShapeSample for Rhombus {
+    type Output = Vec2;
+
+    fn sample_interior<R: Rng + ?Sized>(&self, rng: &mut R) -> Vec2 {
+        let x: f32 = rng.gen_range(0.0..=1.0);
+        let y: f32 = rng.gen_range(0.0..=1.0);
+
+        let unit_p = Vec2::NEG_X + x * Vec2::ONE + Vec2::new(y, -y);
+        unit_p * self.half_diagonals
+    }
+
+    fn sample_boundary<R: Rng + ?Sized>(&self, rng: &mut R) -> Vec2 {
+        let x: f32 = rng.gen_range(-1.0..=1.0);
+        let y_sign = if rng.r#gen() { -1.0 } else { 1.0 };
+
+        let y = (1.0 - ops::abs(x)) * y_sign;
+        Vec2::new(x, y) * self.half_diagonals
+    }
+}
+
 impl ShapeSample for Rectangle {
     type Output = Vec2;