Separate MurmurHash32 from hash_functions.cuh (#13681)

Moves the `MurmurHash32` class definition from `hash_functions.cuh` to a new `murmur32.cuh` file.
Also moves the new file and the `hash_functions.cuh` from `cpp/include/cudf/detail/utilities/` to `cpp/include/cudf/hashing/detail`
The hash functions were redeclared from the `cudf::detail` namespace to the `cudf::hashing::detail` namespace.

The remaining changes are side-effects of making the above changes.
This PR is a follow on to PR #13626 
No new logic or functions have changed. Only internal detail headers have been refactored.

Authors:
  - David Wendt (https://github.com/davidwendt)

Approvers:
  - AJ Schmidt (https://github.com/ajschmidt8)
  - Bradley Dice (https://github.com/bdice)
  - Karthikeyan (https://github.com/karthikeyann)

URL: #13681

conda/recipes/libcudf/meta.yaml

@@ -139,7 +139,6 @@ outputs:
         - test -f $PREFIX/include/cudf/detail/groupby.hpp
         - test -f $PREFIX/include/cudf/detail/groupby/group_replace_nulls.hpp
         - test -f $PREFIX/include/cudf/detail/groupby/sort_helper.hpp
-        - test -f $PREFIX/include/cudf/detail/hashing.hpp
         - test -f $PREFIX/include/cudf/detail/interop.hpp
         - test -f $PREFIX/include/cudf/detail/is_element_valid.hpp
         - test -f $PREFIX/include/cudf/detail/join.hpp
@@ -192,6 +191,7 @@ outputs:
         - test -f $PREFIX/include/cudf/fixed_point/temporary.hpp
         - test -f $PREFIX/include/cudf/groupby.hpp
         - test -f $PREFIX/include/cudf/hashing.hpp
+        - test -f $PREFIX/include/cudf/hashing/detail/hashing.hpp
         - test -f $PREFIX/include/cudf/interop.hpp
         - test -f $PREFIX/include/cudf/io/avro.hpp
         - test -f $PREFIX/include/cudf/io/csv.hpp

cpp/CMakeLists.txt

@@ -344,8 +344,8 @@ add_library(
   src/groupby/sort/sort_helper.cu
   src/hash/hashing.cu
   src/hash/md5_hash.cu
-  src/hash/murmur_hash.cu
-  src/hash/spark_murmur_hash.cu
+  src/hash/murmurhash3_x86_32.cu
+  src/hash/spark_murmurhash3_x86_32.cu
   src/interop/dlpack.cpp
   src/interop/from_arrow.cu
   src/interop/to_arrow.cu

cpp/include/cudf/detail/aggregation/result_cache.hpp

@@ -18,7 +18,7 @@
 
 #include <cudf/column/column.hpp>
 #include <cudf/detail/aggregation/aggregation.hpp>
-#include <cudf/detail/hashing.hpp>
+#include <cudf/hashing/detail/hashing.hpp>
 #include <cudf/types.hpp>
 
 #include <unordered_map>

cpp/include/cudf/detail/join.hpp

@@ -16,7 +16,7 @@
 #pragma once
 
 #include <cudf/column/column.hpp>
-#include <cudf/detail/utilities/hash_functions.cuh>
+#include <cudf/hashing.hpp>
 #include <cudf/table/table_view.hpp>
 #include <cudf/types.hpp>
 #include <cudf/utilities/default_stream.hpp>