lnms user:add command (#9830)

* Add lnms user:add command
Uses events to mark past notifications as read (even for non-manually added users)

* Filter out previous options from auto-completion

* use validation to check cli input

* Warn if using other auth

* abstract LnmsCommand

* Use setPassword helper for hashing instead of mutator

* Extract validation function

app/Events/UserCreated.php

@@ -0,0 +1,24 @@
+<?php
+
+namespace App\Events;
+
+use App\Models\User;
+use Illuminate\Broadcasting\InteractsWithSockets;
+use Illuminate\Foundation\Events\Dispatchable;
+use Illuminate\Queue\SerializesModels;
+
+class UserCreated
+{
+    use Dispatchable, InteractsWithSockets, SerializesModels;
+    public $user;
+
+    /**
+     * Create a new event instance.
+     *
+     * @param User $user
+     */
+    public function __construct(User $user)
+    {
+        $this->user = $user;
+    }
+}