How to profile the loading of an R package

So an issue with using the detach method from @davide-lorino is that if there are entangled depends or imports, it will fail, and fail hard.

A better method is to use a future backend that loads each of the imports in a clean R session, and time how long it takes to load them via library.

I implemented this in a package that might be useful to others: https://github.com/rmflight/importedPackageTimings