Merge pull request #8583 from metabase/qp-refactor-part-6

src/metabase/models/dimension.clj

src/metabase/query_processor.clj

.../query_processor/middleware/add_dimension_projections.clj

...y_processor/middleware/auto_bucket_datetime_breakouts.clj

test/metabase/api/dataset_test.clj

test/metabase/api/embed_test.clj

test/metabase/driver/bigquery_test.clj

test/metabase/driver/druid_test.clj

test/metabase/driver/generic_sql/native_test.clj

test/metabase/driver/h2_test.clj

...y_processor/middleware/add_dimension_projections_test.clj

test/metabase/query_processor_test.clj