feat: adds --flaky cli option

src/TestCaseMethodFilters/FlakyTestCaseFilter.php

@@ -0,0 +1,19 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Pest\TestCaseMethodFilters;
+
+use Pest\Contracts\TestCaseMethodFilter;
+use Pest\Factories\TestCaseMethodFactory;
+
+final readonly class FlakyTestCaseFilter implements TestCaseMethodFilter
+{
+    /**
+     * Filter the test case methods.
+     */
+    public function accept(TestCaseMethodFactory $factory): bool
+    {
+        return $factory->flakyTries !== null;
+    }
+}