Invites: Invite types, invite flags & deprecate withExpiration opt

[conorwastakenwastaken]

Refs:
Added type field to invites:

• Added invite type discord/discord-api-docs#6568
• Add invite type to Invite Create event discord/discord-api-docs#7465

Added Guest Invite Flags:

• feat(invite): Guest invites discord/discord-api-docs#6247

Deprecates withExpiration option in any getInvite() functions - This is no longer used by Discord and the expiration date is now sent without supplying this query:

• Remove query param that no longer exists on GET /invites/<code> discord/discord-api-docs#7424
• Update invite docs discord/discord-api-docs#7779

[conorwastakenwastaken]

To Do:

• Guest invites flags
• Invite types
• with_permissions option when getting invites (with-permissions query discord/discord-api-docs#7768 - tested myself) apparently this isn't meant to be public or considered stable for bots
• Completely remove Invite#stageInstance???
• Document invite profile discord/discord-api-docs#7849 ?? - tested myself

Is it worth completely removing Invite#stageInstance since that's been deprecated for a while? Will keep this PR as a draft until I get confirmation from abal or bsian about that