feat(http,model)!: auto moderation http methods and mention spam

[7596ff]

Closes #1709.

Closes #1867.

Changelog

Remove TriggerType::HarmfulLink, add TriggerType::MentionSpam.

Add requests CreateAutoModerationRule, DeleteAutoModerationRule, GetAutoModerationRule, GetGuildAutoModerationRules, and UpdateAutoModerationRule.

CreateAutoModerationRule ensures the correct trigger metadata is supplied by replacing exec with with_trigger_keyword, with_spam, and with_trigger_keyword_preset.

[vilgotf]

Still looks good