Fixes #5584: `yii\rbac\DbRbacManager` should not delete items when deleting a rule on a database not supporting cascade update

Fixes #5435: Added extra checks to `yii\rbac\DbManager` to prevent database exceptions when `$userId` is empty

Replaced `clearAll()` and `clearAllAssignments()` in `yii\rbac\ManagerInterface` with `removeAll()`, `removeAllRoles()`, `removeAllPermissions()`, `removeAllRules()` and `removeAllAssignments()`

Re-implemented RBAC by following more closely to the original NIST RBAC model. Dropped `yii\rbac\PhpManager`.

issue #2852