feat(utils): readFileToString method using UTF-8 charset

src/main/java/org/auioc/mods/arnicalib/utils/java/FileUtils.java

@@ -3,6 +3,7 @@
 import static org.auioc.mods.arnicalib.ArnicaLib.LOGGER;
 import java.io.BufferedWriter;
 import java.io.File;
+import java.io.FileNotFoundException;
 import java.io.FileWriter;
 import java.io.IOException;
 import java.nio.charset.Charset;
@@ -37,13 +38,29 @@ public static File getFile(String fileName) throws IOException {
         throw new IOException("Could not create parent directory of file \"" + file + "\"");
     }
 
+    /**
+     * Reads the contents of a file into a String using the UTF-8 charset.
+     * The file is always closed.
+     *
+     * @param file the file to read, must not be {@code null}
+     * @return the file contents, never {@code null}
+     * @throws NullPointerException  if file is {@code null}.
+     * @throws FileNotFoundException if the file does not exist, is a directory rather than a regular file, or for some other reason cannot be opened for reading.
+     * @throws IOException           if an I/O error occurs.
+     * @see org.apache.commons.io.FileUtils#readFileToString(File, Charset)
+     * @since 5.1.4
+     */
+    public static String readFileToString(final File file) throws IOException {
+        return readFileToString(file, Charset.forName("utf8"));
+    }
 
     /**
      * Writes a String to a file creating the file if it does not exist using the UTF-8 charset.
      *
      * @param file the file to write
      * @param data the content to write to the file
      * @throws IOException in case of an I/O error
+     * @see org.apache.commons.io.FileUtils#writeStringToFile(File, String, Charset, boolean)
      * @since 5.1.4
      */
     public static void writeStringToFile(final File file, final String data) throws IOException {