Have getUser return early (not make a network request) when there is no session token

[AlexDWu]

Supabase docs say to use getUser in NextJS middleware, but I notice that is a network request to verify the User session for every request in the NextJS app even when there is no session token. Seems like we can optimize things a bit by not making that network request when there is no session token. maybe have getUser return

{
  data:
    { user: null },
  error: new AuthSessionMissingError(),
}

[AlexDWu]

Oh! I see this is already in master