resolve large ints to BigInteger

resolve large ints to BigInteger

The in-place type detection for Python integers, as occurs with an
expression such as ``literal(25)``, will now apply value-based adaption as
well to accommodate Python large integers, where the datatype determined
will be :class:`.BigInteger` rather than :class:`.Integer`. This
accommodates for dialects such as that of asyncpg which both sends implicit
typing information to the driver as well as is sensitive to numeric scale.

Fixes: #7909
Change-Id: I1cd3ec2676c9bb03ffedb600695252bd0037ba02