[deprecation] Deprecate AbstractScopeAwareRector in favor of single AbstractRector

[TomasVotruba]

With upcoming php-parser 5 and PHPStan 2 BC breaks, it's ideal time to cleanup some deprecated code and bad design choices :)

The Rector\Rector\AbstractScopeAwareRector is first of them. This "handy class" is too granular just to fetch single helper object. It makes creating new custom rules ambiguous, one layer more complex and confusing.

It will be removed in favor of standard AbstractRector and Scope object can be fetched via ScopeFetcher.

That way you can use single class for all rules, and fetch scope when and where needed.