Motivation for this change

I am trying to use magma with cuda-10, which involved bumping magma to 2.3.0 to support my gpu's architecture. Note that this PR uses the default cudatoolbelt so nuances addressed in #54836 do not apply here.

From what I can see on their website the current stable version seems to be 2.3.0. That said, it looks like 2.4.0 is complete and v2.5.0 is in active development. I've included all of the versions listed, except for 2.5.0, using cudnn/default.nix as a reference for the code.

Magma also supports mkl, I've added it as an optional dependency.

Again, from #54836, I'm not terribly affluent with building nix packages (many kudos to @tstat for helping me get through the build errors). I've tested this on ubuntu with 2.3.0 and 2.4.0 with defaults, mkl, and with cuda-10. I can't build 2.0.2 on my machine because of an incompatible gpu architecture.

CI should break because I'm not sure how best to package this in pkgs/top-level/all-packages.nix, I'm hoping for some feedback/guidelines here.

Thank you!
-s

Things done

• Tested using sandboxing (nix.useSandbox on NixOS, or option sandbox in nix.conf on non-NixOS)
• Built on platform(s)
  • NixOS
  • macOS
  • other Linux distributions
• Tested via one or more NixOS test(s) if existing and applicable for the change (look inside nixos/tests)
• Tested compilation of all pkgs that depend on this change using nix-shell -p nox --run "nox-review wip"
• Tested execution of all binary files (usually in ./result/bin/)
• Determined the impact on package closure size (by running nix path-info -S before and after)
• Assured whether relevant documentation is up to date
• Fits CONTRIBUTING.md.