(CONT-1193) - Add `--providers` and `--list-providers` flags

[jordanbreen28]

Summary

This PR finishes the implementation of the providers flag as this was never completed. It also adds a new flag that can be used to list all available providers and their respective types within the module.

Additional Context

adding --providers to a describe command i.e. describe firewall --providers, returns the providers for the firewall type.

running --list-providers lists all providers in the module.

Checklist

• [x] 🟢 Spec tests.
• [x] 🟢 Acceptance tests.
• [x] Manually verified.

[chelnak]

Fantastic stuff! Thanks @jordanbreen28 🙏