so that it can appear in the crawl log, add contentSize to CrawlURI extraInfo, for http transactions (the only case in heritrix currently where contentLength and contentSize differ)
Merge branch 'extra-info-size' into aitfive-203
for kafka/amqp crawl log feeds, remove now redundant contentSize from extraInfo
Merge branch 'aitfive-203' of github.com:nlevitt/heritrix3 into aitfive-203