Add captcha image generation functionality.

app/Captcha/Dto/Sectors.php

@@ -0,0 +1,24 @@
+<?php declare(strict_types=1);
+
+namespace App\Captcha\Dto;
+
+final class Sectors
+{
+    private array $points = [];
+
+    public function add(int|float $x, int|float $y, int|float $width, int|float $height): self
+    {
+        $this->points[] = new Sector((int) $x, (int) $y, (int) $width, (int) $height);
+
+        return $this;
+    }
+
+    public function random(): Sector
+    {
+        $key = array_rand($this->points);
+        $sector = $this->points[$key];
+        unset($this->points[$key]);
+
+        return $sector;
+    }
+}