Fix: InviteMetadata and Invite definitions #1495

[Fyers]

• added target_user?, target_user_type? to Invite
• removed IsRevoked / revoked Metadata-Field which does not exist - https://discord.com/developers/docs/resources/invite#invite-metadata-object-invite-metadata-structure
• removed nullable value type from InviteMetadata since its not nullable - https://discord.com/developers/docs/resources/invite#invite-metadata-object-invite-metadata-structure
• moved inviter from Metadata to the actual Invite object like in the docs.

[kamranayub]

This is helpful, I'm generating invites for specific users and was looking for this 💯 Pulled it into my fork.

[kamranayub]

@Fyers What do you think about including the needed params for CreateInviteAsync? Will need to add target_user and target_user_type there too. I can add it in my fork and test it out, I can reference the commit then for this PR.

See: https://discord.com/developers/docs/resources/channel#create-channel-invite

edit: I think target_user should be snowflake since docs say "user id" but the type it shows is string 😕 It would make sense to be an ID. Ah, user IDs are serialized as string in JSON.

edit 2: OK, nevermind, looks like this is for something else because it only works with target_user_type of 1 which is STREAM for streamers. It doesn't work if you try to pass a plain user ID without a type.

[SubZero0]

If you want this merged in a minor version, you will need to not remove or change any public properties (and I don't see a major coming any time soon).

[Fyers]

If you want this merged in a minor version, you will need to not remove or change any public properties (and I don't see a major coming any time soon).

I could re-add the IsRevoked and Revoked property and mark it as obsolete.

[SubZero0]

Obsolete would be fine plus reverting all return type changes for public properties.