message: Add Datasource Name filter under slice list view
diff: @@ -420,7 +420,7 @@ class SliceModelView(SupersetModelView, DeleteMixin): # noqa
  'datasource_link': _('Datasource'),
  }
  search_columns = (
  - 'slice_name', 'description', 'viz_type', 'owners',
  + 'slice_name', 'description', 'viz_type', 'datasource_name', 'owners',
  )
  list_columns = [
  'slice_link', 'viz_type', 'datasource_link', 'creator', 'modified']
  