add forced select_handler mode for all cases

Sometimes queries runs slow , but suddenly runs fast without "order by" clause
or wrapping into a subselect like select * from (<select query>)

Even every case must be fixed , it should be a possibility to force the behaviour
of wrapping the query in a subselect, so application must not be changed,
so something like

columnstore_forced_subselect,

so simply set

set columnstore_forced_subselect = 1;

can work as a workarround,

Must be certainly dynamically and possible with global and session level.