Reduce the size of the cugraph libraries

By explicitly telling nvcc's fatbin pass to always compress device code
we can ensure that our binaries are the smallest possible size.

See rapidsai/cudf#7583 for additional context.

cpp/CMakeLists.txt

@@ -116,6 +116,7 @@ set(FAISS_GPU_ARCHS "${FAISS_GPU_ARCHS} -gencode arch=compute_${ptx},code=comput
 set(CMAKE_CUDA_FLAGS "${CMAKE_CUDA_FLAGS} --expt-extended-lambda --expt-relaxed-constexpr")
 set(CMAKE_CUDA_FLAGS "${CMAKE_CUDA_FLAGS} -Werror=cross-execution-space-call -Wno-deprecated-declarations -Xptxas --disable-warnings")
 set(CMAKE_CUDA_FLAGS "${CMAKE_CUDA_FLAGS} -Xcompiler -Wall,-Wno-error=sign-compare,-Wno-error=unused-but-set-variable")
+set(CMAKE_CUDA_FLAGS "${CMAKE_CUDA_FLAGS} -Xfatbin=-compress-all")
 
 # Option to enable line info in CUDA device compilation to allow introspection when profiling /
 # memchecking