Add SMS bulk delay configuration and validate coupon phone function

app/Enums/SmsSendStatus.php

@@ -0,0 +1,11 @@
+<?php
+
+namespace App\Enums;
+
+enum SmsSendStatus: string
+{
+    case Pending = 'pending';
+    case Sent = 'sent';
+    case Failed = 'failed';
+    case SkippedInvalid = 'skipped_invalid';
+}