Encrypt more data!

[reesericci]

Unfortunately, during the encryption rollout many attributes failed to encrypt properly due to not being strings or otherwise.

We should encrypt these! It just requires code change to support reading them as strings from the DB and writing migrations.

• User::Credential
  • webauthn_id
  • public_key
  • sign_count
• User::User
  • otp_counter
  • otp_last_minted