RGW: Implement continuation, progress, stats, end s3select response

RGW: Implement continuation, progress, stats, end s3select response

    RGW/S3select: Implement output-serializationi. user may request different CSV defintions
    for output (field delimiter, row delimiter, quote handling.

    RGW/S3select: Implement presto-alignments. presto-application sends
    queries with table-alias,case insensitive, and with no-semicolon at the
    end of statement.

    RGW/s3select: zero object size issue

    Signed-off-by: Albin Antony <aantony@redhat.com>
    Signed-off-by: galsalomon66 <gal.salomon@gmail.com>