Get rid of prepareStatement overhead

[eivanov89]

In a multistep transaction we send prepare transaction requests multiple times (obtaining a session each time, which can be blocking).

Alex, you told you know, how to avoid this stuff. Please, have a look again.

[alex268]

We already added a support of caching of prepared queries to JDBC Driver so there is no overhead for requests except for first

[eivanov89]

We already added a support of caching of prepared queries to ydb-platform/ydb-jdbc-driver#37 so there is no overhead for requests except for first

So, do we need just to update JDBC driver (as planned)?

[alex268]

Yes, this issue will be fixed after updating to new version of JDBC driver