[dx] Make registration of custom NodeVisitor is easier

[TomasVotruba]

This feature is really useful https://getrector.com/documentation/creating-a-node-visitor,
but it's way too complicated to register. Let's make it simple 👍

Ref rectorphp/getrector-com#3455

---

Before

<?php

use Rector\Config\RectorConfig;
use My\Rector\Visitor\HelloVisitor;
use Rector\NodeTypeResolver\PHPStan\Scope\Contract\NodeVisitor\ScopeResolverNodeVisitorInterface;

return RectorConfig::configure()
    ->registerService(HelloVisitor::class, null, ScopeResolverNodeVisitorInterface::class);

Now

use Rector\Config\RectorConfig;

return RectorConfig::configure()
    ->registerDecoratingNodeVisitor(IsAssignedLeftNodeVisitor::class);

[github-actions]

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