[FEATURE REQUEST] Allow creating automation tokens from the CLI

[ajhall]

Is your feature request related to a problem? Please describe.
I can create user tokens from the CLI, but not automation tokens. I'd like to be able to do both.

Describe the solution you'd like
I'd like a feature to create automation tokens added to the CLI. For example, maybe it could be a parameter on the existing fastly auth-token create command, such as fastly auth-token create --type=automation.

Describe alternatives you've considered
I could call the API directly.

Additional context

• User tokens API: https://developer.fastly.com/reference/api/auth-tokens/user/
• Automation tokens API: https://developer.fastly.com/reference/api/auth-tokens/automation/