Support configuring Long Range Security Keys with environment variables

[bobcob7]

Is your feature request related to a problem? Please describe.
I'm running zwave-js in a Kubernetes cluster and I like to have my security keys for my zwave be secrets in kubernetes. Up to this point, I was able to use the documented environment variables to configure these. However, now that I'm trying to setup long range, I noticed that these keys aren't exposed as environment variables.

Describe the solution you'd like
Be able to configure long range security keys using environment variables.

Describe alternatives you've considered
Setting the access keys in a configuration file and making that entire file a secret in kubernetes.

Additional context