This sets a new username, completes onboarding and allows a user to start using Revolt.
New username which will be used to identify the user on the platform
User
Unique Id
Username
Discriminator
Display name
User's pronouns
File
Relationships with other users
Bitfield of user badges
https://docs.rs/revolt-models/latest/revolt_models/v0/enum.UserBadges.html
User's active status
Enum of user flags
https://docs.rs/revolt-models/latest/revolt_models/v0/enum.UserFlags.html
Whether this user is privileged
Bot information for if the user is a bot
User's relationship with another user (or themselves)
Whether this user is currently online