@nx/powerpack-s3-cache - log remote cache filenames

[laneysmith]

Prior to adopting @nx/powerpack-s3-cache we used @pellegrims/nx-remotecache-s3 for remote caching, which was built on top of nx-remotecache-custom. That library had thorough logs listing out the files being written to and read from the cache: https://github.com/NiklasPor/nx-remotecache-custom/blob/main/lib/log.ts

We found these logs to be helpful for debugging complex cache issues. We'd love to see an option to log cache filenames in @nx/powerpack-s3-cache as well.