feast(services): add duration solver

app/Services/WorkingDays/DurationSolverFactory.php

@@ -0,0 +1,29 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Services\WorkingDays;
+
+use App\Services\Utils\DurationConvertor;
+
+class DurationSolverFactory
+{
+    public function __construct(
+        private readonly WorkingDayDeterminerFactory $workingDayDeterminerFactory,
+        private readonly DurationConvertor $durationConvertor,
+    ) {
+    }
+
+    /**
+     * Create DurationSolver instance for a specific country
+     * @param string $countryCode
+     * @return DurationSolver
+     */
+    public function createDurationSolverForCountry(string $countryCode): DurationSolver
+    {
+        return new DurationSolver(
+            $this->workingDayDeterminerFactory->createForCountry($countryCode),
+            $this->durationConvertor,
+        );
+    }
+}