Use library to zip resource pack

This fixes the resource pack not working. Previously, the resource pack was displaying in the resource pack menu, including the `pack.png`, but no resources would actually work in-game.

`zip4j` library: https://github.com/srikanth-lingala/zip4j
Someone else who was having a similar (if not the exact same) issue: https://www.spigotmc.org/threads/minecraft-does-not-accept-my-generated-zip-file-as-resource-pack.94596/

build.gradle.kts

@@ -74,6 +74,8 @@ dependencies {
   paperweight.paperDevBundle(paperApiVersion + "-R0.1-SNAPSHOT")
 
   implementation("dev.jorel" , "commandapi-bukkit-shade-mojang-mapped" , "9.5.1")
+
+  implementation("net.lingala.zip4j", "zip4j", "2.11.5")
 }
 
 tasks {

src/main/java/net/slqmy/template_paper_plugin/file/FileUtil.java

@@ -4,23 +4,17 @@
 import java.util.Collections;
 import java.util.List;
 import java.util.jar.JarFile;
-import java.util.zip.ZipEntry;
-import java.util.zip.ZipOutputStream;
 import java.util.jar.JarEntry;
 import java.io.File;
 import java.io.FileInputStream;
-import java.io.FileOutputStream;
 import java.io.IOException;
 import java.io.InputStream;
 import java.net.URL;
-import java.nio.file.FileVisitResult;
-import java.nio.file.Files;
-import java.nio.file.Path;
-import java.nio.file.SimpleFileVisitor;
-import java.nio.file.attribute.BasicFileAttributes;
 import java.security.MessageDigest;
 import java.security.NoSuchAlgorithmException;
 
+import net.lingala.zip4j.ZipFile;
+
 public class FileUtil {
 
   private static final String FILE_EXTENSION_SEPARATOR = ".";
@@ -66,18 +60,16 @@ public static List<String> getResourceFileFolderResourceFilePathsRecursively(Str
     return paths;
   }
 
-  public static void zipFolder(Path sourceFolderPath, Path zipPath) throws Exception {
-    ZipOutputStream zipOutputStream = new ZipOutputStream(new FileOutputStream(zipPath.toFile()));
-    Files.walkFileTree(sourceFolderPath, new SimpleFileVisitor<Path>() {
-      @Override
-      public FileVisitResult visitFile(Path file, BasicFileAttributes attributes) throws IOException {
-        zipOutputStream.putNextEntry(new ZipEntry(sourceFolderPath.relativize(file).toString()));
-        Files.copy(file, zipOutputStream);
-        zipOutputStream.closeEntry();
-        return FileVisitResult.CONTINUE;
+  public static void zipFolder(File sourceFolder, File zipFile) throws IOException {
+    try (ZipFile zipFileInstance = new ZipFile(zipFile)) {
+      for (File file : sourceFolder.listFiles()) {
+        if (file.isDirectory()) {
+          zipFileInstance.addFolder(file);
+        } else {
+          zipFileInstance.addFile(file);
+        }
       }
-    });
-    zipOutputStream.close();
+    }
   }
 
   public static String getSha1HexString(File file) {

src/main/java/net/slqmy/template_paper_plugin/resource_pack/ResourcePackManager.java

@@ -57,7 +57,7 @@ private void saveResourcepackZipFile() {
 
     try {
       resourcePackZipFile = new File(resourcePackZipFilePath);
-      FileUtil.zipFolder(resourcePackFolder.toPath(), resourcePackZipFile.toPath());
+      FileUtil.zipFolder(resourcePackFolder, resourcePackZipFile);
 
       FileUtils.deleteDirectory(resourcePackFolder);
     } catch (Exception exception) {