ISQL -X: add comment with version of server and ISQL itself [CORE5208]

Submitted by: @pavel-zotov

Votes: 1

It will be useful if starting part of metadata that ISQL extracts will look like this:

/\* GENERATED <timestamp here\> by: ISQL Version LI\-T4\.0\.0\.142\. Server version: LI\-T4\.0\.0\.142  \*/

SET SQL DIALECT \.\.\.;
\. \. \.
