A simple working version of smart-pgjdbc for pgjdbc-v42.3.3

Added features: (1) Configure the rewriting server URL and APP GUID through a smart-pgjdbc.config file under the user's home directory; (2) Profile query performance and synchronize with the rewriting server.

A simple working version of smart-pgjdbc for pgjdbc-v42.3.3

smart_v42.3.3

[smart-pgjdbc] initial commit with a working version of intercepting …