Implement Display for Val (bevyengine#10296)

# Objective

Implement `Display` for `Val`

---------

Co-authored-by: Alice Cecile <alice.i.cecile@gmail.com>

crates/bevy_ui/src/geometry.rs

@@ -4,6 +4,7 @@ use bevy_reflect::ReflectDeserialize;
 use bevy_reflect::ReflectSerialize;
 use serde::Deserialize;
 use serde::Serialize;
+use std::fmt::Display;
 use std::ops::Neg;
 use std::ops::{Div, DivAssign, Mul, MulAssign};
 use thiserror::Error;
@@ -155,6 +156,22 @@ impl DivAssign<f32> for Val {
     }
 }
 
+impl Display for Val {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        let (value, suffix) = match self {
+            Val::Auto => return write!(f, "auto"),
+            Val::Px(value) => (value, "px"),
+            Val::Percent(value) => (value, "%"),
+            Val::Vw(value) => (value, "vw"),
+            Val::Vh(value) => (value, "vh"),
+            Val::VMin(value) => (value, "vmin"),
+            Val::VMax(value) => (value, "vmax"),
+        };
+        value.fmt(f)?;
+        write!(f, "{suffix}")
+    }
+}
+
 impl Neg for Val {
     type Output = Val;