Add auto moderation

[SQKo]

https://discord.com/developers/docs/resources/auto-moderation

discord/discord-api-docs#4860

discord/discord-api-docs#5063
discord/discord-api-docs#5079
discord/discord-api-docs#5082
discord/discord-api-docs#5083

Example create:

$rule = new Rule($discord, [
    'name' => 'custom keyword 2',
    'event_type' => 1,
    'trigger_type' => 1,
    'actions' => [
        [
            'type' => 1,
            'metadata' => []
        ]
    ],
    'trigger_metadata' => [
        'keyword_filter' => ['boggo']
    ]
]);

$guild->auto_moderation_rules->save($rule)->done(function ($automodrules) {
    var_dump($automodrules);
});

Need testing:

• Events
• Repositories
• Execution

Also need opinion on the file & class naming