codeintel: Add migration to add count of locations in lsif_data_{definitions,references}
requested to merge ef/denormalize-moniker-locations-counts into ef/standardized-codeintel-oobmigrations
Created by: efritz
This is prerequisite effort to https://github.com/sourcegraph/sourcegraph/issues/18554.
This PR builds on the infrastructure laid out by https://github.com/sourcegraph/sourcegraph/pull/18667. In a similar fashion, we add a num_locations and schema_verion column on both the lsif_data_definitions and lsif_data_references tables, as well as create two aggregate tables (lsif_data_definitions_schema_versions and lsif_data_references_schema_version) to count the min and max schema version for each upload.