Allow the use of management statements in PSQL blocks
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                 Key: CORE-5887
                 URL: http://tracker.firebirdsql.org/browse/CORE-5887
             Project: Firebird Core
          Issue Type: Improvement
          Components: Engine
            Reporter: Adriano dos Santos Fernandes


Current management (SET ... / ALTER SESSION) statements are valid only
as top-level statements (and hence in EXECUTE STATEMENT too), i.e.,
cannot be in EXECUTE BLOCK or stored routine.

This is a problem, as some of these statements are good to be executed
in ON CONNECT triggers.

I propose a simple way to allow them in PSQL.

There is no reason to create BLR codes for them.

DSQL can generate them as EXECUTE STATEMENT (blr_exec_sql).

They will be validated (dsqlPass) as others statements in prepare time,
and will be validated as now when executed.

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