Add information about DLSS support to Proton Log

Feature Request

I confirm:

• that I haven't found another request for this feature.
• that I have checked whether there are updates for my system available that
  contain this feature already.

Description

I've packaged the latest beta 470.42.01 nvidia-drivers for Exherbo Linux letting the two {_,}nvngx.dll files getting installed to /usr/x86_64-pc-linux-gnu/lib/nvidia/wine/, using Proton Experimental I'm able to select DLSS within No Man's Sky and it appears to work, however I'm not able to tell if it actually does. I can't find the dlls being copied into the proton prefix compatdata/275850/pfx/drive_c/windows/system32/ and there doesn't seem to be any log output whether it actually tries to copy the files, does so succesfully, or fail to find/copy them.

It would be nice to have steam report the DLSS support or {_,}nvngx.dll files in the steam system information or the pressure-vessel information output.

Additionally it would be nice if Proton could throw something on the command line like it does for fsync fsync: up and running.

Attached is my steam system-information.txt

Review the attached system-information.txt and the existing Steam system-information, pressure-vessel information, and Proton command-line output paths. Determine where DLSS or {_,}nvngx.dll availability and copy results should be reported. Done means Steam or pressure-vessel output identifies support and Proton logs whether the files were found and copied successfully.