add strict-mode

[staabm]

error on non literal query strings args

See

• https://github.com/phpstan/phpstan-doctrine/pull/252
• https://github.com/staabm/phpstan-dba/issues/71

———

report any non-simulatable input as error (as we already do in debug-mode)

[staabm]

Kind of overlaps with https://github.com/staabm/phpstan-dba/issues/316