CommandRegistration beans should be "optional"

[jvalkeal]

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As with #380 command registrations more fully dynamic and user can just define CommandRegistration as a bean it might be beneficial to allow user to define when to register those beans.

Use case for not to automatically register CommandRegistration as a bean might be that you still want those as a bean in an application context(possibly handling registration manually). Maybe some annotations to disable registrations or settings in a autoconfiguration or something similar.

[Koooooo-7]

Hi @jvalkeal , I m wondering what means the optional? If user register CommandRegistration in a @Bean way, they already have the @ConfitionalOnXXX to control those beans.