New Invite Target User Endpoints and Options

Create Channel Invite now takes an array of target user IDs without uploading a CSV file by using target_user_ids. Update Target Users replaces an invite's entire target user list from an uploaded CSV, which is processed as an asynchronous job. Changing a single user meant rebuilding and re-uploading the whole file. These four endpoints adjust the list in place, extending the invite endpoints.

• Add Target User: Adds a single user to an invite's target users
• Remove Target User: Removes a single user from an invite's target users
• Bulk-Add Target Users: Adds multiple users, passed as a user_ids array of snowflakes
• Bulk-Delete Target Users: Removes multiple users, passed as a user_ids array of snowflakes

All four require the caller to be the inviter or have the MANAGE_GUILD permission.