Mark records in delete events as deleted and remove in the snapshot queries

[theferrit32]

Add to record_metadata in each add-data-* transformer function. Example for variation: https://github.com/clingen-data-model/genegraph/blob/97a327f783e7911392f31b63fb8edebe1637cd4e/src/genegraph/transform/clinvar/variation.clj#L402

Add filter to statement and variant snapshot selects Statement: https://github.com/clingen-data-model/genegraph/blob/97a327f783e7911392f31b63fb8edebe1637cd4e/src/genegraph/transform/clinvar/ga4gh.clj#L282 Variation: https://github.com/clingen-data-model/genegraph/blob/97a327f783e7911392f31b63fb8edebe1637cd4e/src/genegraph/transform/clinvar/ga4gh.clj#L397