Support java.nio.file Paths and FileSystems with nested jars

Add a `NestedFileSystemProvider` implementation so that the JDK's
`ZipFileSystem` can load content from nested jars and nested
directory entries.

Creating a `ZipFileSystem` may be a relatively expensive operation as
zip structures need to be parsed and in the case of directory entries
a virtual datablock nees to be generated on the fly. As such, we
install the `ZipFileSystem` as late as possible since in a typical
application it may never be needed.

This commit also tweaks Gradle and Maven plugins to ensure that the
service loader file is written to repackaged jars.

Closes gh-7161

spring-boot-tests/spring-boot-integration-tests/spring-boot-loader-tests/spring-boot-loader-tests-app/build.gradle

@@ -1,6 +1,8 @@
 plugins {
 	id "java"
 	id "org.springframework.boot"
+//  id 'org.springframework.boot' version '3.1.4'
+//  id 'io.spring.dependency-management' version '1.1.3'
 }
 
 apply plugin: "io.spring.dependency-management"

spring-boot-tests/spring-boot-integration-tests/spring-boot-loader-tests/spring-boot-loader-tests-app/src/main/java/org/springframework/boot/loaderapp/LoaderTestApplication.java

@@ -17,8 +17,13 @@
 package org.springframework.boot.loaderapp;
 
 import java.io.File;
+import java.io.IOException;
+import java.io.UncheckedIOException;
 import java.net.JarURLConnection;
 import java.net.URL;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
 import java.util.Arrays;
 
 import jakarta.servlet.ServletContext;
@@ -27,6 +32,8 @@ import org.springframework.boot.CommandLineRunner;
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
 import org.springframework.context.annotation.Bean;
+import org.springframework.core.io.ClassPathResource;
+import org.springframework.core.io.Resource;
 import org.springframework.util.FileCopyUtils;
 
 @SpringBootApplication
@@ -49,9 +56,20 @@ public class LoaderTestApplication {
 			String message = (!Arrays.equals(resourceContent, directContent)) ? "NO MATCH"
 					: directContent.length + " BYTES";
 			System.out.println(">>>>> " + message + " from " + resourceUrl);
+			testGh7161();
 		};
 	}
 
+	private void testGh7161() {
+		try {
+			Resource resource = new ClassPathResource("gh-7161");
+			Path path = Paths.get(resource.getURI());
+			System.out.println(">>>>> gh-7161 " + Files.list(path).toList());
+		} catch (IOException ex) {
+			throw new UncheckedIOException(ex);
+		}
+	}
+
 	public static void main(String[] args) {
 		SpringApplication.run(LoaderTestApplication.class, args).close();
 	}

spring-boot-tests/spring-boot-integration-tests/spring-boot-loader-tests/src/intTest/java/org/springframework/boot/loader/LoaderIntegrationTests.java

@@ -51,11 +51,12 @@ class LoaderIntegrationTests {
 
 	@ParameterizedTest
 	@MethodSource("javaRuntimes")
-	void readUrlsWithoutWarning(JavaRuntime javaRuntime) {
+	void runJar(JavaRuntime javaRuntime) {
 		try (GenericContainer<?> container = createContainer(javaRuntime, "spring-boot-loader-tests-app", null)) {
 			container.start();
 			System.out.println(this.output.toUtf8String());
 			assertThat(this.output.toUtf8String()).contains(">>>>> 287649 BYTES from")
+				.contains(">>>>> gh-7161 [/gh-7161/example.txt]")
 				.doesNotContain("WARNING:")
 				.doesNotContain("illegal")
 				.doesNotContain("jar written to temp");