Fetch rapids-cmake to work around cuCollection cmake issue (#9075)

Fixes #9073.

Adds explicit fetching of rapids-cmake v21.10 to work around build issues outside of the conda environment caused by NVIDIA/cuCollections#104.

Authors:
  - Jason Lowe (https://github.com/jlowe)

Approvers:
  - Robert Maynard (https://github.com/robertmaynard)
  - Alessandro Bellina (https://github.com/abellina)

URL: #9075

cpp/CMakeLists.txt

@@ -28,6 +28,17 @@ elseif(CMAKE_CUDA_ARCHITECTURES STREQUAL "")
   set(CUDF_BUILD_FOR_DETECTED_ARCHS TRUE)
 endif()
 
+file(DOWNLOAD https://raw.githubusercontent.com/rapidsai/rapids-cmake/branch-21.10/RAPIDS.cmake
+    ${CMAKE_BINARY_DIR}/RAPIDS.cmake)
+include(${CMAKE_BINARY_DIR}/RAPIDS.cmake)
+
+include(rapids-cmake)
+include(rapids-cpm)
+include(rapids-cuda)
+include(rapids-export)
+include(rapids-find)
+
+
 project(CUDF VERSION 21.10.00 LANGUAGES C CXX)
 
 # Needed because GoogleBenchmark changes the state of FindThreads.cmake,