feat(rule): add PhoneNumber custmo rule for reusability

app/Rules/PhoneNumber.php

@@ -0,0 +1,21 @@
+<?php
+
+namespace App\Rules;
+
+use Closure;
+use Illuminate\Contracts\Validation\ValidationRule;
+
+class PhoneNumber implements ValidationRule
+{
+    /**
+     * Run the validation rule.
+     *
+     * @param  \Closure(string, ?string=): \Illuminate\Translation\PotentiallyTranslatedString  $fail
+     */
+    public function validate(string $attribute, mixed $value, Closure $fail): void
+    {
+        if (! preg_match('/^\d{4} \d{4} \d{3,5}$/', $value)) {
+            $fail('Format :attribute tidak valid. Harus seperti "0812 3456 789", "0812 3456 7890" atau "0812 3456 78901".');
+        }
+    }
+}