InputStream unnecessarily wraps read buffers with a new ByteBuffer

I believe the Buffers.copy(ByteBuffer.wrap(b, off, len), buffer) can be replaced by
buffer.get(b, off, Math.min(len, buffer.remaining())) to avoid the ByteBuffer indirection.

https://github.com/undertow-io/undertow/blob/2abb6a2822c6a97904bba4d4b7a601b8e95c4122/core/src/main/java/io/undertow/io/UndertowInputStream.java#L97

https://github.com/undertow-io/undertow/blob/2abb6a2822c6a97904bba4d4b7a601b8e95c4122/servlet/src/main/java/io/undertow/servlet/spec/ServletInputStreamImpl.java#L186