OZG-5009 add snackBarMessage to properties to create a command; adjust snackBar handling

...ent/libs/command-shared/src/lib/+state/command.actions.ts

...ibs/command-shared/src/lib/+state/command.effects.spec.ts

...ent/libs/command-shared/src/lib/+state/command.effects.ts

alfa-client/libs/command-shared/src/lib/command.model.ts

alfa-client/libs/command-shared/test/command.ts