Collect all 2-4 protocol messages required for execution of prepared query in one ChannelBuffer instead of writing them individually to the socket
Merge branch 'merge-writes' of https://github.com/gmokki/pgjdbc-ng into feature/merge-writes
Rewrite all message writing/sending following gmokki's idea of merging message writes

• All current commands are now sent in a single channel write
* All "sendXXX" methods are now "writeXXX" methods and only write to a channel buffer
• Buffer allocation is explicit and required to be done by the caller
Merge branch 'feature/merge-writes' into develop