Test encoding and Unicode normalization for scanned resources

This commit introduces tests which serve as "regression tests" for the
behavior of PathMatchingResourcePatternResolver in Spring Framework
5.3.x with regard to URL-encoding and Unicode normalization of resource
paths.

Specifically, the new tests demonstrate that resource paths do NOT need
to be decoded or normalized in 5.3.x.

See gh-29243

spring-core/src/test/java/example/japanese/バリューオブジェクト/バリューオブジェクト.java

@@ -0,0 +1,26 @@
+/*
+ * Copyright 2002-2022 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package example.japanese.バリューオブジェクト;
+
+/**
+ * This class and its package exist in order to test encoding and Unicode
+ * normalization for resource paths discovered via classpath scanning.
+ *
+ * <p>"バリューオブジェクト" is Japanese for "value object".
+ */
+public class バリューオブジェクト {
+}