Add option to output the sniff codes in the report

phpcs has an option to output the "sniff codes" of the violations that occur. This is very helpful to pinpoint the exact sniff that has thrown a warning. It would be nice to pass through this option.

$ phpcs --help       
Usage: phpcs [-nwlsaepvi] [-d key[=value]]
        ...
        -s            Show sniff codes in all reports

$ phpcs --standard=Drupal -s .
FILE: ...odules/paddle_editorial_notes/paddle_editorial_notes.features.field.inc
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FOUND 0 ERROR(S) AND 3 WARNING(S) AFFECTING 3 LINE(S)
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  13 | WARNING | Line exceeds 80 characters; contains 81 characters
     |         | (Drupal.Files.LineLength.TooLong)
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