Store bind handlers on first access

Update `ConfigurationPropertiesBinder` so that bind handler are fetched
and stored once.

Closes gh-42950

Author: philwebb

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/context/properties/ConfigurationPropertiesBinder.java

@@ -76,6 +76,8 @@ class ConfigurationPropertiesBinder {
 
 	private final boolean jsr303Present;
 
+	private volatile List<ConfigurationPropertiesBindHandlerAdvisor> bindHandlerAdvisors;
+
 	private volatile Binder binder;
 
 	ConfigurationPropertiesBinder(ApplicationContext applicationContext) {
@@ -126,6 +128,18 @@ private <T> BindHandler getBindHandler(Bindable<T> target, ConfigurationProperti
 		return handler;
 	}
 
+	private List<ConfigurationPropertiesBindHandlerAdvisor> getBindHandlerAdvisors() {
+		List<ConfigurationPropertiesBindHandlerAdvisor> bindHandlerAdvisors = this.bindHandlerAdvisors;
+		if (bindHandlerAdvisors == null) {
+			bindHandlerAdvisors = this.applicationContext
+				.getBeanProvider(ConfigurationPropertiesBindHandlerAdvisor.class)
+				.orderedStream()
+				.toList();
+			this.bindHandlerAdvisors = bindHandlerAdvisors;
+		}
+		return bindHandlerAdvisors;
+	}
+
 	private IgnoreTopLevelConverterNotFoundBindHandler getHandler() {
 		BoundConfigurationProperties bound = BoundConfigurationProperties.get(this.applicationContext);
 		return (bound != null)
@@ -164,12 +178,6 @@ private Validator getJsr303Validator(Class<?> type) {
 		return new ConfigurationPropertiesJsr303Validator(this.applicationContext, type);
 	}
 
-	private List<ConfigurationPropertiesBindHandlerAdvisor> getBindHandlerAdvisors() {
-		return this.applicationContext.getBeanProvider(ConfigurationPropertiesBindHandlerAdvisor.class)
-			.orderedStream()
-			.toList();
-	}
-
 	private Binder getBinder() {
 		if (this.binder == null) {
 			this.binder = new Binder(getConfigurationPropertySources(), getPropertySourcesPlaceholdersResolver(),