Forward more methods to underlying InputStream in NonClosingInputStream

NonClosingInputStream extends FilterInputStream, which does not forward some
newer InputStream methods such as transferTo and readAllBytes. Specific InputStream
implementations may have more optimized methods (e.g., FileInputStream).

Closes gh-34893

Signed-off-by: Patrick Strawderman <pstrawderman@netflix.com>

Author: kilink

spring-core/src/main/java/org/springframework/util/StreamUtils.java

@@ -239,7 +239,7 @@ public static OutputStream nonClosing(OutputStream out) {
 	}
 
 
-	private static class NonClosingInputStream extends FilterInputStream {
+	private static final class NonClosingInputStream extends FilterInputStream {
 
 		public NonClosingInputStream(InputStream in) {
 			super(in);
@@ -248,10 +248,30 @@ public NonClosingInputStream(InputStream in) {
 		@Override
 		public void close() throws IOException {
 		}
+
+		@Override
+		public byte[] readAllBytes() throws IOException {
+			return in.readAllBytes();
+		}
+
+		@Override
+		public byte[] readNBytes(int len) throws IOException {
+			return in.readNBytes(len);
+		}
+
+		@Override
+		public int readNBytes(byte[] b, int off, int len) throws IOException {
+			return in.readNBytes(b, off, len);
+		}
+
+		@Override
+		public long transferTo(OutputStream out) throws IOException {
+			return in.transferTo(out);
+		}
 	}
 
 
-	private static class NonClosingOutputStream extends FilterOutputStream {
+	private static final class NonClosingOutputStream extends FilterOutputStream {
 
 		public NonClosingOutputStream(OutputStream out) {
 			super(out);