Move _prod/sum_over_axis to _tensor_reductions_impl

Author: vlad-perevezentsev

dpctl_ext/tensor/CMakeLists.txt

@@ -78,9 +78,9 @@ set(_reduction_sources
     #${CMAKE_CURRENT_SOURCE_DIR}/libtensor/source/reductions/logsumexp.cpp
     ${CMAKE_CURRENT_SOURCE_DIR}/libtensor/source/reductions/max.cpp
     ${CMAKE_CURRENT_SOURCE_DIR}/libtensor/source/reductions/min.cpp
-    #${CMAKE_CURRENT_SOURCE_DIR}/libtensor/source/reductions/prod.cpp
+    ${CMAKE_CURRENT_SOURCE_DIR}/libtensor/source/reductions/prod.cpp
     #${CMAKE_CURRENT_SOURCE_DIR}/libtensor/source/reductions/reduce_hypot.cpp
-    #${CMAKE_CURRENT_SOURCE_DIR}/libtensor/source/reductions/sum.cpp
+    ${CMAKE_CURRENT_SOURCE_DIR}/libtensor/source/reductions/sum.cpp
 )
 set(_sorting_sources
     ${CMAKE_CURRENT_SOURCE_DIR}/libtensor/source/sorting/isin.cpp