Draft: Compat with golang 1.17

Some customers need to build the components of the NVIDIA Container Toolkit from source using Golang 1.17.

This MR defines some minor change that allow the project to be built using Go 1.17, with an internal/errors package being used to provide basic errors.Join functionality. This is the only feature we currently use from Go 1.20.

Signed-off-by: Evan Lezar elezar@nvidia.com