Add ability to provide custom token repository creation logic

[ollieread]

This PR adds the ability to create custom token repositories for the password broker.

Custom creators are registered with the PasswordBrokerManager:

app('auth.password')->repository('redis', function ($app, $config) {
    return new RedisTokenRepository($config);
});

And provided in the config using the driver value:

[
  'passwords' => [
      'users' => [
          'provider' => 'users',
          'driver' => 'redis',
          'connection' => 'redis',
          'expire' => 60,
          'throttle' => 60,
      ],
  ],

If the driver config value is missing, or equal to database, the default implementation is used.

Note

I'm unsure how you want this to be tested, as this part of the codebase doesn't appear to be tested at all, instead, all the elements it interacts with are mocked and dealt with directly.