fix(validation): throw when trying to call em.flush()
from hooks
#574
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Hooks are executed inside the commit action of unit of work, after all change
sets are computed. This means that it is not possible to create new entities as
usual from inside the hook. Calling
em.flush()
from hooks will result invalidation error. Calling
em.persist()
can result in undefined behaviour likelocking errors.
Closes #493