* Allow to directly attach and detach an instance of `Orchestra\Model\Role` via `Orchestra\Model\User`.
* Remove following traits on `Orchestra\Model\User`:
    - `Orchestra\Notifier\Notifiable`
    - `Illuminate\Auth\Passwords\CanResetPassword`
* Remove following contracts on `Orchestra\Model\User`:
    - `Orchestra\Contracts\Notification\Recipient`
    - `Illuminate\Contracts\Auth\CanResetPassword`

Signed-off-by: crynobone <crynobone@gmail.com>