add token as an alias for auth

[russorat]

influx auth matches the API, but it's not what a user thinks about when they want to work with tokens. we should consider an alias that is influx token for this command.

[danxmoran]

For max discoverability, we could make token the official name of the command, and demote auth to an alias.

Would we also want to add an alias for v1 auth? Should it become v1 user (with an alias of v1 auth), since it's a username/password-based system?