* Add new Nvidia feature

* Remove random empty files

* Update comments

* Rename feature to nvidia-cuda

* Add feature to tests

* Add version

* Move test to match new name

* Add final output message

* Fix capitalization of NVIDIA

* Remove option for base CUDA

* Use camelCase

* Check for required packages

* Use os-release instead of lsb_release

* Clean up keyring variables

* Collapse keyring lines

* Always install CUDA libraries

* Add option to install NVTX

* Always use ubuntu2004 repo

* Use test instead of brackets

* Add default values to feature

* Add version options for CUDA and cuDNN

* Rename CUDA version option

* Add scenario to test specific CUDA/cuDNN version

* Rename cuDNN scenario

* Fix typo in test scenario

* Update variable casing

* Add more helpful error messages

* Remove default values from script

* Use enum for version option

* Polish new scenarios

* Remove apt_get_update_if_needed and check_packages

* Add more versions

* Improve error messages

* Comments and feature description
Co-authored-by: Josh Spicer <joshspicer@github.com>