[6.x] Extract CallOtherCommands feature from Illuminate\Console\Command

[crynobone]

At the moment Illuminate\Console\Command is tightly couple with Laravel
via $this->laravel->make() usage, this changes make it possible to reuse
CallOtherCommands feature available for Laravel commands to standalone
Symfony commands.

<?php
namespace Foo\Commands;

use Illuminate\Console\Concerns\CallOtherCommands;
use Symfony\Component\Console\Input\InputInterface;
use Symfony\Component\Console\Output\OutputInterface;

abstract class Command extends \Symfony\Component\Console\Command\Command
{
    use CallOtherCommands;

    /**
     * Resolve the console command instance for the given command.
     *
     * @param  string  $command
     * @return \Symfony\Component\Console\Command\Command
     */
    protected function resolveCommand($command)
    {
        return $this->getApplication()->find($command);
    }
}

Signed-off-by: Mior Muhammad Zaki [email protected]