Make concept of stateless validator

[xepozz]

Q	A
Is bugfix?	❌
New feature?	✔️
Breaks BC?	✔️

I want to make Validator stateless.
It will avoid to create instance every time when we want to validate another dataset or rules.
Also it will be a little bit user-friendly when we want to get instance of Validator with usage DI:

public function action(ValidatorInterface $validator) 
{
    $result = $validator->validate($request, $rules);
}

vs

public function action(ValidatorFactoryInterface $validatorFactory) 
{
    $validator = $validatorFactory->create($rules);
    $result = $validator->validate($request);
}

[samdark]

Overall 👍

[samdark]

Needs to be adjsuted for #106

[samdark]

👍