feat: improves fatal exception handling

src/Contracts/Plugins/Terminable.php

@@ -0,0 +1,16 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Pest\Contracts\Plugins;
+
+/**
+ * @internal
+ */
+interface Terminable
+{
+    /**
+     * Terminates the plugin.
+     */
+    public function terminate(): void;
+}