Add checkstyle rule for List.of() / Set.of() / Map.of()

This commits adds a checkstyle rule to not use List.of(), Set.of()
and Map.of(), preferring Collections.emptyList(), emptySet(), and
emptyMap() respectively.

It replaces usages of these methods across the codebase.

See gh-32655

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/kafka/KafkaPropertiesTests.java

@@ -16,6 +16,7 @@
 
 package org.springframework.boot.autoconfigure.kafka;
 
+import java.util.Collections;
 import java.util.Map;
 
 import org.apache.kafka.common.config.SslConfigs;
@@ -55,7 +56,7 @@ class KafkaPropertiesTests {
 
 	@Test
 	void adminDefaultValuesAreConsistent() {
-		KafkaAdmin admin = new KafkaAdmin(Map.of());
+		KafkaAdmin admin = new KafkaAdmin(Collections.emptyMap());
 		Admin adminProperties = new KafkaProperties().getAdmin();
 		assertThat(admin).hasFieldOrPropertyWithValue("fatalIfBrokerNotAvailable", adminProperties.isFailFast());
 		assertThat(admin).hasFieldOrPropertyWithValue("modifyTopicConfigs", adminProperties.isModifyTopicConfigs());

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/web/WebResourcesRuntimeHintsTests.java

@@ -18,6 +18,7 @@ package org.springframework.boot.autoconfigure.web;
 
 import java.net.URL;
 import java.net.URLClassLoader;
+import java.util.Collections;
 import java.util.List;
 import java.util.function.Consumer;
 
@@ -52,7 +53,7 @@ class WebResourcesRuntimeHintsTests {
 
 	@Test
 	void registerHintsWithNoLocation() {
-		RuntimeHints hints = register(new TestClassLoader(List.of()));
+		RuntimeHints hints = register(new TestClassLoader(Collections.emptyList()));
 		assertThat(hints.resources().resourcePatternHints()).isEmpty();
 	}