Make sure expression aggregations come back with name

src/metabase/mbql/predicates.clj

src/metabase/query_processor/interface.clj

src/metabase/query_processor/middleware/annotate.clj

...tabase/query_processor/middleware/wrap_value_literals.clj

src/metabase/sync/analyze/query_results.clj

test/metabase/query_processor/middleware/annotate_test.clj

test/metabase/test/data.clj