Add automod support

[MinnDevelopment]

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• I have checked the PRs for upcoming features/bug fixes.
• I have read the contributing guidelines.

Changes

• Internal code
• Library interface (affecting end-user code)
• Documentation
• Other: _____

Closes Issue: NaN

Description

This implements the AutoMod API.

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

Example

Creating an automod rule:

guild.createAutoModRule(
  AutoModRule.onMessage("No morbius memes", TriggerConfig.keywordFilter("*morb*"))
             .putResponses(AutoModResponse.blockMessage("This meme is unfunny."))
).queue();

Here, AutoModRule.onMessage(...) creates a rule of event type MESSAGE_SEND with the name No morbius memes. The trigger config sets the trigger type to KEYWORD and sets the keyword_filter to ["*morb*"].

Bots can react to auto-mod rule activations using the AutoModExecutionEvent:

public void onAutoModExecution(AutoModExecutionEvent event) {
  long user = event.getUserIdLong();
  if (event.getRuleIdLong() == BAN_RULE) {
    event.getGuild().ban(user, 0, TimeUnit.DAYS).queue();
  }
}

Note that access to AutoModExecution#getContent also requires the MESSAGE_CONTENT intent.

TODO

• Creating rules
• Modifying rules (manager)
• Deleting rules
• Getting existing rules
• Events
  • GatewayIntent#fromEvents
• Audit Logs
• Permissions
• Checks
• Documentation
• ErrorResponse constants

Potential Additions:

• Document Blocking Words in Member Profiles Automod discord/discord-api-docs#6040