Improve perfomance

[arogachev]

Adaptations to changes in related packages:

• Improve perfomance rbac-php#63
• Improve perfomance rbac-cycle-db#71
• Improve perfomance rbac-db#46

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For example: separate getting direct children and all (recursive).

There are different use cases.

Direct:

rbac/src/Manager.php

Line 147 in ce83aa8

if (isset($this->itemsStorage->getChildren($parentName)[$childName])) {

All (recursive):

rbac/src/Manager.php

Line 319 in ce83aa8

$this->getChildrenRecursive($roleName, $result);

Current DB implementations are likely incorrect and can cause performance issues.