public @NonNull Builder<C> manager(final @Nullable CommandManager<C> commandManager) {
            return new Builder<>(
                    commandManager,
                    this.commandMeta,
                    this.senderType,
                    this.commandComponents,
                    this.commandExecutionHandler,
                    this.permission,
                    this.flags,
                    this.commandDescription
            );
        }
Supplies a command manager instance to the builder.
<p>
This will be used when attempting to
retrieve command argument parsers, in the case that they're needed.
<p>
This is optional.

@param commandManager Command manager
@return new builder instance using the provided command manager
cloud-core/src/main/java/org/incendo/cloud/Command.java