Extend ._tensor_impl with copy functions (#2774)

This PR extends `_tensor_impl` in `dpctl_ext.tensor` with the copy
functions (`_copy_usm_ndarray_for_reshape` ,
`_copy_numpy_ndarray_into_usm_ndarray`. `_copy_usm_ndarray_for_roll_1d`,
`_copy_usm_ndarray_for_roll_nd`)

It also adds `asnumpy(), astype(), copy(), from_numpy(), to_numpy(),
roll(), and reshape()` to `dpctl_ext.tensor` and updates the
corresponding dpnp functions to use these implementations internally

Author: vlad-perevezentsev

dpctl_ext/tensor/CMakeLists.txt

@@ -48,9 +48,9 @@ set(_tensor_impl_sources
     # ${CMAKE_CURRENT_SOURCE_DIR}/libtensor/source/accumulators.cpp
     ${CMAKE_CURRENT_SOURCE_DIR}/libtensor/source/copy_and_cast_usm_to_usm.cpp
     ${CMAKE_CURRENT_SOURCE_DIR}/libtensor/source/copy_as_contig.cpp
-    # ${CMAKE_CURRENT_SOURCE_DIR}/libtensor/source/copy_numpy_ndarray_into_usm_ndarray.cpp
-    # ${CMAKE_CURRENT_SOURCE_DIR}/libtensor/source/copy_for_reshape.cpp
-    # ${CMAKE_CURRENT_SOURCE_DIR}/libtensor/source/copy_for_roll.cpp
+    ${CMAKE_CURRENT_SOURCE_DIR}/libtensor/source/copy_numpy_ndarray_into_usm_ndarray.cpp
+    ${CMAKE_CURRENT_SOURCE_DIR}/libtensor/source/copy_for_reshape.cpp
+    ${CMAKE_CURRENT_SOURCE_DIR}/libtensor/source/copy_for_roll.cpp
     # ${CMAKE_CURRENT_SOURCE_DIR}/libtensor/source/linear_sequences.cpp
     ${CMAKE_CURRENT_SOURCE_DIR}/libtensor/source/integer_advanced_indexing.cpp
     # ${CMAKE_CURRENT_SOURCE_DIR}/libtensor/source/boolean_advanced_indexing.cpp

dpctl_ext/tensor/__init__.py

@@ -27,6 +27,13 @@
 # *****************************************************************************
 
 
+from dpctl_ext.tensor._copy_utils import (
+    asnumpy,
+    astype,
+    copy,
+    from_numpy,
+    to_numpy,
+)
 from dpctl_ext.tensor._ctors import (
     full,
     tril,
@@ -36,11 +43,22 @@
     put,
     take,
 )
+from dpctl_ext.tensor._manipulation_functions import (
+    roll,
+)
+from dpctl_ext.tensor._reshape import reshape
 
 __all__ = [
+    "asnumpy",
+    "astype",
+    "copy",
+    "from_numpy",
     "full",
     "put",
+    "reshape",
+    "roll",
     "take",
+    "to_numpy",
     "tril",
     "triu",
 ]