rapids-cmake fetching should log the source of rapids-cmake

We have logic in each RAPIDS repo that fetches rapids-cmake from a given repo/tag. Example: https://github.com/rapidsai/rmm/blob/e6da1f34889c93fd53c85538c23143c20b8e4bd4/cmake/RAPIDS.cmake#L72-L75

It would be good to log the source being used during `RAPIDS.cmake` execution. Something like `message(STATUS ...)` to show the parameters used for `FetchContent_Declare`.