static Opener create(ByteBufferReader reader) {
            // Usually the user can open many times,
            // and most of the time we don't want the reader realy be closed,
            // so lets set it null.
            return b -> ByteBufferReader.of(reader, b, null);
        }
Wrap a ByteBufferReader into an {@link Opener}.
Note that the close will <b>not</b> passed to the opener,
indexr-common/src/main/java/io/indexr/io/ByteBufferReader.java