DRILL-4369: Exchange name and version infos during handshake
There's no name and version exchanged between client and server over the User RPC
channel.
On client side, having access to the server name and version is useful to expose it
to the user (through JDBC or ODBC api like DatabaseMetadata#getDatabaseProductVersion()),
or to implement fallback strategy when some recent API are not available (like
metadata API).
On the server side, having access to the client version might be useful for audit
purposes and eventually to implement fallback strategy if it doesn't require a RPC
version change.
this closes #622
