`QueryDataReader::createItem()` shold be realized in `Db\Query` class

[Tigrov]

QueryDataReader::createItem() method should be removed

data-db/src/QueryDataReader.php

Lines 17 to 21 in 174652b

	protected function createItem(array|object $row): array|object
	{
	/** @psalm-var TValue */
	return $row;
	}

BatchQueryResult already has property Closure $populateMethod to prepare row result

https://github.com/yiisoft/db/blob/e380ae2ffb6f3a466e6f168fafa93548e50f0d8c/src/Query/BatchQueryResult.php#L109

Instead of these, Db\Query class can contain property Closure $callback (and withCallback() method) which will be called for each row from result.

The $callback will be specified in one place (Query) instead of many different realizations. And this will allow to use Query directly to get prepared result (without any data reader).