[Slim4] Add string formats support to Data Mocker

Created by: ybelenko

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New string formats mocking:

use OpenAPIServer\Mock\OpenApiDataMocker as Mocker;
$mocker = new Mocker();
$data = $mocker->mockFromSchema([
    'type' => 'object',
    'properties' => [
        'byte' => [
            'type' => 'string',
            'format' => 'byte',
        ],
        'binary' => [
            'type' => 'string',
            'format' => 'binary',
            'minLength' => 16,
        ],
        'date' => [
            'type' => 'string',
            'format' => 'date',
        ],
        'datetime' => [
            'type' => 'string',
            'format' => 'date-time',
        ],
        'password' => [
            'type' => 'string',
            'format' => 'password',
        ],
        'email' => [
            'type' => 'string',
            'format' => 'email',
        ],
        'uuid' => [
            'type' => 'string',
            'format' => 'uuid',
        ],
    ],
]);

echo json_encode($data, JSON_PRETTY_PRINT);

Output:

{
    "byte": "TA==",
    "binary": "TG9yZW0gaXBzdQ==",
    "date": "1975-10-19",
    "datetime": "2006-08-03T00:43:34+00:00",
    "password": "12345",
    "email": "mlking@example.com",
    "uuid": "5e1a245500fd5"
}

Related to #3545 (closed)

cc @jebentier, @dkarlovi, @mandrean, @jfastnacht, @ackintosh, @renepardon