sql: Parameterization of aggregates with WHERE IN

Allow parameterization of a WHERE IN clause when the SELECT
contains aggregations. The aggregation across the keys in from the
WHERE IN still must execute as a post-lookup operation.

Release-Note-Core: Allow parameterizing WHERE IN
  clauses when the query contains aggregations.
Change-Id: Iaf28fb394c4964e5d7e9869b3741fc2017c492d5
Reviewed-on: https://gerrit.readyset.name/c/readyset/+/7399
Tested-by: Buildkite CI
Reviewed-by: Ethan Donowitz <ethan@readyset.io>

Author: jasobrown-rs