run provider command as a sub command to init

[jacobsalmela]

Summary and Scope

• Merging a provider command with the cani init command works ok for one provider, but when adding more, clashes can occur if two providers set the same flags. This change makes a new provider command for each provider, and merges CANI's flags with it. This results in each provider having CANI's flags and their own, without clashing with another provider. To accomplish this, the command name is the same as the provider via the Slug() method, and then when an argument to session init is a valid provider, it executes the providers init command
• Changes if cmd.Name() == "init"s to if cmd.Parent().Name() == "init" since init calls subcommands
• this requires one change to a test, which checks csm-specific flags on a fake provider

Risks and Mitigations