fix(guild): don't cache emojis/stickers/scheduled events if intent is disabled

[shiftinv]

Summary

Discord sends some fields in GUILD_CREATEs that are otherwise gated by intents, previously resulting in the library caching (and never updating) emojis, stickers, and scheduled_events even with the intent disabled.

This PR fixes the caching behavior to only cache them if the corresponding intent is enabled. It shouldn't affect non-gw guilds like those from fetch_guild etc., which continue to populate the emoji/sticker attributes.

No documentation changes since it didn't seem necessary, but can be added if there's demand for it.

This was brought up here: https://canary.discord.com/channels/808030843078836254/942319505915412500/1130943549937029170

Checklist

• If code changes were made, then they have been tested
  • I have updated the documentation to reflect the changes
  • I have formatted the code properly by running pdm lint
  • I have type-checked the code by running pdm pyright
• This PR fixes an issue
• This PR adds something new (e.g. new method or parameters)
• This PR is a breaking change (e.g. methods or parameters removed/renamed)
• This PR is not a code change (e.g. documentation, README, ...)