Feature: Support for user metadata

[lexum0]

The user metadata is used to store user information or sign in information (to hold information like name and last name before the user confirms their email and a profile is created)

To save the user info at sign up:

try await supabase.auth.signUp(
  email: "example@email.com",
  password: "example-password",
  data: [
    "first_name": .string("John"),
    "age": .number(24)
  ]
)

You need to click Sign up with additional user metadata in the docs to show the function
https://supabase.com/docs/reference/swift/auth-signup

To read get the current data: supabase.auth.session.user.userMetadata

To update or remove the metadata:

try await supabase.auth.update(
  user: UserAttributes(
    data: [
      "hello": .string("world")
    ]
  )
)

https://supabase.com/docs/reference/swift/auth-updateuser