public @This @NonNull Builder<C, T> commandManager(final @Nullable CommandManager<C> commandManager) {
            this.commandManager = commandManager;
            return this;
        }
Sets the command manager, which will be used to create a parser if none is provided.

<p>If the command manager is {@code null} and no {@link #parser(ArgumentParser)} is specified then
the command component is invalid.</p>

@param commandManager the command manager
@return {@code this}
cloud-core/src/main/java/org/incendo/cloud/component/CommandComponent.java