DataSourcePoolNewConnectionListener for listening of new connections

[Ryszard-Trojnacki]

I have implemented a ConnectionListener that is called when a new connection is created and added to the pool.

This listener has two methods. One (onCreatedConnection) is called at the begining of initialization of new connection by Ebean (start of initConnection method) second (onAfterInitialized) is called at the end of initialization process.

Not sure is two are needed.

This can be used to extend connection parameters like:

void onCreatedConnection(Connection connection) {
    PGvector.registerTypes(conn)
}