feat: Allow findForPassport to optionally receive the OAuth client

[maximepvrt]

Currently, Laravel Passport uses the findForPassport(string $username) method to retrieve the user during password grant authentication. This method only receives the username, which limits cases where we might want to filter users based on the OAuth client.

This PR introduces the possibility to define findForPassport with a second optional parameter, a ClientEntityInterface $client, allowing:

• Filtering users based on the OAuth client if needed.
• Maintaining compatibility with existing methods that only accept one parameter.

Example usage:

use Laravel\Passport\Bridge\Client;

public function findForPassport(string $username, Client $client)
{
    return $this->where('email', $username)
        ->whereHas('clients', function ($q) use ($client) {
            $q->where('id', $client->getIdentifier());
        })->first();
}

This is not a breaking change: existing methods with a single parameter will continue to work.

📖 I also prepared a PR for the documentation to explain this new possibility: laravel/docs#10880

[hafezdivandari]

No need to use reflection, just pass the $clientEntity as argument. If you want to make this change, please apply the same to line 38:

- $user = (new $model)->findAndValidateForPassport($username, $password);
+ $user = (new $model)->findAndValidateForPassport($username, $password, $clientEntity);

[maximepvrt]

@hafezdivandari updated ;-)