[5.7] Add options for SES Mailer

[CyrilMazur]

This PR allows the developer to add options to the SES mailer, in a similar fashion that is already possible with SparkPost mailer.

Developer may add their options into config/services.php like so:

    'ses' => [
        'key' => env('AWS_S3_KEY'),
        'secret' => env('AWS_S3_SECRET'),
        'region' => env('AWS_S3_REGION', 'eu-west-1'),
        'options' => [
            'ConfigurationSetName' => 'Default',
            'Tags' => [
                [
                    'Name' => 'foo',
                    'Value' => 'bar',
                ]
            ],
        ],
    ],

This is particularly useful for ConfigurationSetName (needed for SES to send notifications for open and click events) and Tags.

If merged, I will subsequently send a PR for updating the doc.