Add make() method

[feryardiant]

Ability to resolve an instance without adding it to the container stack.

Let say you have a class like this

container/test/stub/InstantiableClass.php

Lines 5 to 16 in c0bc43a

	class InstantiableClass
	{
	/**
	* @var stdClass
	*/
	public $dummy;
	public function __construct($dummy)
	{
	$this->dummy = $dummy;
	}
	}

$container->make(InstantiablleClass::class); // Should get InstantiablleClass instance.

If you have callable class like this

container/test/stub/CallableClass.php

Lines 5 to 21 in c0bc43a

	class CallableClass
	{
	/**
	* @var stdClass
	*/
	public $dummy;
	public function __construct($dummy)
	{
	$this->dummy = $dummy;
	}
	public function __invoke(AbstractFoo $foo)
	{
	return $foo;
	}
	}

$container->make(CallableClass::class); // Should get returns value o CallableClass::__invoke().

Note that both InstantiableClass and CallableClass constructor depends on dummy container and CallableClass::__invoke() method depends on AbstractFoo instance. It will automatically resolved if you already have both dummy and AbstractFoo container.

$container->set('dummy', Dummy::class);
$container->set(AbstractFoo::class, ConcreteBar::class);

Otherwise it will throw Psr\Container\NotFoundExceptionInterface

[feryardiant]

I think it should be useful if we could make an instance by condition, let say:

$container->make(SomeClass::class, function ($instance) {
    if ($instance instanceof CertainInterface) {
        // Returns an array of the instance and method required by the interface.
        return [$instance, 'handle'];
    }

    // Returns null to pass the object as is
    return null;
});