Cleanup in prepartion for new hierarchical field types

frontend/src/metabase/lib/core.js

frontend/src/metabase/lib/query.js

resources/migrations/041_drop_field_field_type.yaml

resources/migrations/liquibase.json

sample_dataset/metabase/sample_dataset/generate.clj

src/metabase/db/migrations.clj

src/metabase/models/field.clj

src/metabase/query_processor/expand.clj

src/metabase/query_processor/interface.clj

src/metabase/sync_database/interface.clj

src/metabase/util/schema.clj

test/metabase/api/database_test.clj

test/metabase/api/field_test.clj

test/metabase/api/table_test.clj

test/metabase/models/field_test.clj

test/metabase/sync_database/sync_dynamic_test.clj

test/metabase/sync_database/sync_test.clj

test/metabase/sync_database_test.clj

test/metabase/test/data.clj

test/metabase/test/data/interface.clj