feat(email-blast): tambahkan kelas EmailBlastMail dan tampilan email blast

- Menambahkan kelas EmailBlastMail untuk mengelola pengiriman email blast.
- Mengimplementasikan metode build untuk mengatur subjek dan konten email.
- Menambahkan tampilan blast.blade.php untuk format email blast.

app/Mail/EmailBlastMail.php

@@ -0,0 +1,29 @@
+<?php
+
+namespace Modules\Webstatement\Mail;
+
+use Illuminate\Bus\Queueable;
+use Illuminate\Mail\Mailable;
+use Illuminate\Queue\SerializesModels;
+use Modules\Webstatement\Models\EmailBlastHistory;
+
+class EmailBlastMail extends Mailable
+{
+    use Queueable, SerializesModels;
+
+    public $emailBlastHistory;
+
+    public function __construct(EmailBlastHistory $emailBlastHistory)
+    {
+        $this->emailBlastHistory = $emailBlastHistory;
+    }
+
+    public function build()
+    {
+        return $this->subject($this->emailBlastHistory->subject)
+                    ->view('webstatement::emails.blast')
+                    ->with([
+                        'content' => $this->emailBlastHistory->content
+                    ]);
+    }
+}