Use the Open API Bearer Authentication with bearerFormat instead of Authorization Header for JWT Authentication

**Description**
In the Open API v3 specification, it's possible to set a configuration for Bearer Authentication with the JWT format (see https://swagger.io/docs/specification/authentication/bearer-authentication/). Using this configuration means you don't have to copy and paste the word `BEARER ` every time.

**Example**
ATM, I've decorated the `api_platform.openapi.factory` this way :

```php
decorated)($context);

$schemas = $openApi->getComponents()->getSecuritySchemes();

$schemas['JWT'] = new \ArrayObject([
'type' => 'http',
'scheme' => 'bearer',
'bearerFormat' => 'JWT'
]);

return $openApi;
}
}
```

but I think it could be better if we could set the `bearerFormat` directly in the Api Platform configuration.