chore: export to _compliant

Author: dangotbanned

narwhals/_compliant/__init__.py

@@ -6,6 +6,8 @@
 from narwhals._compliant.expr import CompliantExpr
 from narwhals._compliant.expr import EagerExpr
 from narwhals._compliant.expr import LazyExpr
+from narwhals._compliant.group_by import CompliantGroupBy
+from narwhals._compliant.group_by import EagerGroupBy
 from narwhals._compliant.namespace import CompliantNamespace
 from narwhals._compliant.namespace import EagerNamespace
 from narwhals._compliant.selectors import CompliantSelector
@@ -30,6 +32,7 @@
     "CompliantExpr",
     "CompliantExprT",
     "CompliantFrameT",
+    "CompliantGroupBy",
     "CompliantLazyFrame",
     "CompliantNamespace",
     "CompliantSelector",
@@ -40,6 +43,7 @@
     "EagerDataFrame",
     "EagerDataFrameT",
     "EagerExpr",
+    "EagerGroupBy",
     "EagerNamespace",
     "EagerSelectorNamespace",
     "EagerSeries",