Replace RootAndCurrentTables with TableScope, which keeps track of any tables in scope for an exists, instead of only root and current.#674

BenoitRanque merged 3 commits intobenoit/eng-362-update-ndc-postgres-to-ndc_models-020hasura/ndc-postgres:benoit/eng-362-update-ndc-postgres-to-ndc_models-020from

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