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Improve PostgreSQL storage scheme for the `with-path-denormalized` flavor

Andrés Ezequiel Viso requested to merge generated-differential-D6473-source into generated-differential-D6473-target

Previous version was storing arrays of strings representing tuples for the denormalized relations (dst and loc of the relation resp.). While that simplified the check for duplicates, it turned out to be very inefficient in terms of disk usage. The new version has two distinct lists if bigint (ie. internal ids) for dst and loc resp. To check for duplicates the lists should be zipped, and repeated tuples filtered.

Migrated from D6473 (view on Phabricator)

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