C++ 3.0: Pass client time zone to server

Once IGNITE-21551 is implemented, it will be possible to set the time zone in a user session.

The session time zone is taken into account when calling functions for obtaining the current time (CURRENT_TIMESTAMP, etc), as well as when processing a string literal for the 'TIMESTAMP WITH LOCAL TIME ZONE' type.

For this to work correctly, you need to transfer the client's time zone through the thin client.

p.s. check the TODOs that point to this ticket.