fix: add Field to top-level package

Author: Charles Larivier

metabase/__init__.py

@@ -1,8 +1,9 @@
 from metabase.metabase import Metabase
-from metabase.resources.user import User
+from metabase.resources.dataset import Dataset
+from metabase.resources.field import Field
+from metabase.resources.metric import Metric
 from metabase.resources.permission_group import PermissionGroup
 from metabase.resources.permission_membership import PermissionMembership
-from metabase.resources.table import Table
 from metabase.resources.segment import Segment
-from metabase.resources.metric import Metric
-from metabase.resources.dataset import Dataset
+from metabase.resources.table import Table
+from metabase.resources.user import User