Move flatiter import to indexing section

Author: vlad-perevezentsev

dpnp/__init__.py

@@ -68,7 +68,6 @@
 
 from .dpnp_array import dpnp_array as ndarray
 from .dpnp_array_api_info import __array_namespace_info__
-from .dpnp_flatiter import flatiter as flatiter
 from ._version import get_versions
 from . import exceptions as exceptions
 from . import fft as fft
@@ -308,6 +307,7 @@
     triu_indices_from,
     unravel_index,
 )
+from .dpnp_flatiter import flatiter
 
 # -----------------------------------------------------------------------------
 # Linear algebra