Messaging infrastructure

Put together a quick test to get internal messaging working for appeals
and joining current sources requests. Now that it works, forms that will
leverage messaging will be created.

app/Mail/LocationAppeal.php

@@ -0,0 +1,55 @@
+<?php
+
+namespace App\Mail;
+
+use Illuminate\Bus\Queueable;
+use Illuminate\Mail\Mailable;
+use Illuminate\Mail\Mailables\Content;
+use Illuminate\Mail\Mailables\Envelope;
+use Illuminate\Mail\Mailables\Address;
+use Illuminate\Queue\SerializesModels;
+
+class LocationAppeal extends Mailable
+{
+    use Queueable;
+    use SerializesModels;
+
+    /**
+     * Create a new message instance.
+     */
+    public function __construct()
+    {
+        //
+    }
+
+    /**
+     * Get the message envelope.
+     */
+    public function envelope(): Envelope
+    {
+        return new Envelope(
+            from: new Address('thebadspace@h-i.works', 'TBS Appeal Request'),
+            subject: 'Location Appeal',
+        );
+    }
+
+    /**
+     * Get the message content definition.
+     */
+    public function content(): Content
+    {
+        return new Content(
+            view: 'email.appeal',
+        );
+    }
+
+    /**
+     * Get the attachments for the message.
+     *
+     * @return array<int, \Illuminate\Mail\Mailables\Attachment>
+     */
+    public function attachments(): array
+    {
+        return [];
+    }
+}