[Scripts] Add list-non-composer-based-rules.php script

[TomasVotruba]

Two changes to the rule-listing scripts.

1. scripts/list-unused-rules.php — skip deprecated rules

RectorClassFinder already skipped rules implementing DeprecatedInterface. Now it also skips rules deprecated via docblock or attribute only:

/**
 * @deprecated as it worsens readability...
 */
final class SomeRector extends AbstractRector

#[Deprecated]
final class SomeRector extends AbstractRector

2. New scripts/list-non-composer-based-rules.php

Lists rules from core, doctrine, phpunit and symfony that are not registered in any composer-based.php set — these are candidates for dead rules, as they are not bound to the installed package version.

Output:

Found Rector 763 rules
Found 4 composer-based sets
 * config/set/nette-utils/composer-based.php
 * vendor/rector/rector-symfony/config/sets/symfony/composer-based.php
 * vendor/rector/rector-doctrine/config/sets/composer-based.php
 * vendor/rector/rector-phpunit/config/sets/composer-based.php

Found 68 Rector rules used in composer-based sets

 * Rector\Php71\Rector\BinaryOp\BinaryOpBetweenNumberAndStringRector
 ...
 * Rector\Symfony\Symfony25\Rector\MethodCall\MaxLengthSymfonyFormOptionToAttrRector

Found 695 Rector rules not in any composer-based set, likely dead

The UsedRectorClassResolver class was moved out of list-unused-rules.php into scripts/src/Resolver/, so both scripts share it.