[todo] add required ECS sets

[TomasVotruba]

Add a rule that requirest specific ecs set in ecs.php of particular project.
The rule should implement Rector\Monitor\Analyze\Contract\RuleProcessorInterface and check ecs for given sets. E.g., if PSR12 is requried, there should be ecs.php with:

use Symplify\EasyCodingStandard\Config\ECSConfig;

return ECSConfig::configure()
    ->withPaths([
        __DIR__ . '/src',
    ])
    ->withPreparedSets(psr12: true);