Log in an existing user using email or phone number with password.
final AuthResponse res = await supabase.auth.signInWithPassword(
email: 'example@email.com',
password: 'example-password',
);
final Session? session = res.session;
final User? user = res.user;
final AuthResponse res = await supabase.auth.signInWithPassword(
phone: '+13334445555',
password: 'example-password',
);
final Session? session = res.session;
final User? user = res.user;