Implement basic traits for AspectRatio (#12840)

# Objective
`AspectRatio` is a newtype of `f32`, so it can implement basic traits;
`Copy`, `Clone`, `Debug`, `PartialEq` and `PartialOrd`.

## Solution
Derive basic traits for `AspectRatio`.

crates/bevy_math/src/aspect_ratio.rs

@@ -3,6 +3,7 @@
 use crate::Vec2;
 
 /// An `AspectRatio` is the ratio of width to height.
+#[derive(Copy, Clone, Debug, PartialEq, PartialOrd)]
 pub struct AspectRatio(f32);
 
 impl AspectRatio {