Write Unit Tests

- [ ] Make sure command arguments for `op` are correct
- [ ] Duplication handling in `Get-SecretInfo` and `Get-Secret`
- [ ] `Get-Secret` works for all known variations of Password and Login items
  - Returns totp
- [ ] `Set-Secret` 
  - Types
    - byte[]
    - string
    - SecureString
    - PSCredential
    - Hashtable
  - Create vs Edit
  - Sanitizes Verbose messages