[Backport #237] Add Netty handler to log HTTP wire traffic - #238
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Implements a functionality to log HTTP traffic. It's enabled by enabling debug log. As a user that want's to debug his data flow I need to be able to track what's effectively sent to the HTTP input socket. - Created new WireLogger Netty handler to log information about channel opening/closing and dumping read and write traffic. - Truncate the dumped content to 4KB or can be customised by setting `logstash.httpinput.wire.dump.size` Java system property. - Updated client channel initializer to include such handler. - Updates Java target and source compatibility to use HttpClient provided by JDK standard library since version 11. Co-authored-by: Cas Donoghue <cas.donoghue@gmail.com>
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Clean backport of #237 to
3.xbranch.