Find cusolvermp using standard CMake approach (nv-legate#891)

This PR updates the existing CUSOLVERMP integration to use a more modern CMake approach. This change introduces a rapids-based approach that follows current CMake best practices, making the build configuration more robust and maintainable.

Author: UmarJavaid56

conda/conda-build/build.sh

@@ -22,7 +22,8 @@ if [ -z "$CPU_ONLY" ]; then
   # cutensor, relying on the conda cutensor package
   CMAKE_ARGS+="
 -Dcutensor_DIR=$PREFIX
--DCUSOLVERMP_DIR=$PREFIX"
+-DCMAKE_CUDA_ARCHITECTURES=all-major
+-DCUPYNUMERIC_USE_CUSOLVERMP=ON"
 else
   # When we build without cuda, we need to provide the location of curand
   CMAKE_ARGS+="

cupynumeric_cpp.cmake

@@ -430,11 +430,18 @@ if(NOT Legion_USE_CUDA AND cupynumeric_cuRAND_INCLUDE_DIR)
   target_include_directories(cupynumeric PRIVATE ${cupynumeric_cuRAND_INCLUDE_DIR})
 endif()
 
-if(Legion_USE_CUDA AND CUSOLVERMP_DIR)
-  message(VERBOSE "cupynumeric: CUSOLVERMP_DIR ${CUSOLVERMP_DIR}")
-  target_compile_definitions(cupynumeric PUBLIC "$<$<COMPILE_LANGUAGE:CXX,CUDA>:CUPYNUMERIC_USE_CUSOLVERMP>")
-  target_include_directories(cupynumeric PRIVATE ${CUSOLVERMP_DIR}/include)
-  target_link_libraries(cupynumeric PRIVATE ${CUSOLVERMP_DIR}/lib/libcusolverMp.so)
+option(CUPYNUMERIC_USE_CUSOLVERMP "Build with CUSOLVERMP" OFF)
+
+if(Legion_USE_CUDA AND CUPYNUMERIC_USE_CUSOLVERMP)
+  rapids_find_generate_module(CUSOLVERMP HEADER_NAMES cusolverMp.h LIBRARY_NAMES cusolverMp)
+  rapids_find_package(CUSOLVERMP REQUIRED)
+  if(TARGET CUSOLVERMP::CUSOLVERMP)
+    message(VERBOSE "cupynumeric: CUSOLVERMP found")
+    target_compile_definitions(cupynumeric PUBLIC "$<$<COMPILE_LANGUAGE:CXX,CUDA>:CUPYNUMERIC_USE_CUSOLVERMP>")
+    target_link_libraries(cupynumeric PRIVATE CUSOLVERMP::CUSOLVERMP)
+  else()
+    message(FATAL_ERROR "CUSOLVERMP not found. Please ensure CUSOLVERMP is installed and available in the CMAKE_PREFIX_PATH.")
+  endif()
 endif()
 
 target_compile_options(cupynumeric