Postpone some more stuff out of ExecInitModifyTable.

Postpone some more stuff out of ExecInitModifyTable.

Delay creation of the projections for INSERT and UPDATE tuples
until they're needed.  This saves a pretty fair amount of work
when only some of the partitions are actually touched.

The logic associated with identifying junk columns in UPDATE/DELETE
is moved to another loop, allowing removal of one loop over the
target relations; but it didn't actually change at all.

Extracted from a larger patch, which seemed to me to be too messy
to push in one commit.

Amit Langote, reviewed at different times by Heikki Linnakangas and
myself

Discussion: https://postgr.es/m/CA+HiwqG7ZruBmmih3wPsBZ4s0H2EhywrnXEduckY5Hr3fWzPWA@mail.gmail.com