Force closing a persistent connection via StreamConnection::close()

This is necessary in cases of "out-of-sync" errors or when re-authentication
is required. How to test/reproduce:

// test_auth.php
<?php

// Run php -S localhost:8000 test_auth.php,
// then open the http://localhost:8000/?close=0 page
// and then http://localhost:8000/?close=1
// (authentication must be initiated for both requests)

declare(strict_types=1);

use Tarantool\Client\Client;
use Tarantool\Client\Middleware\AuthenticationMiddleware;

require __DIR__.'/vendor/autoload.php';

$client = Client::fromDsn('tcp://localhost:3301?persistent=true');
$client = $client->withMiddleware(new AuthenticationMiddleware('guest'));

if (isset($_REQUEST['close']) && $_REQUEST['close']) {
    $client->getHandler()->getConnection()->close();
}

$client->ping();

src/Connection/Connection.php

@@ -27,7 +27,7 @@ interface Connection
     public function open() : Greeting;
 
     /**
-     * Closes an opened connection.
+     * Closes an opened connection (including a persistent one).
      */
     public function close() : void;
 

src/Connection/StreamConnection.php

@@ -119,6 +119,12 @@ public function open() : Greeting
 
     public function close() : void
     {
+        // To close a previously opened persistent connection,
+        // we need to obtain its stream handler first
+        if (!$this->stream && $this->options['persistent']) {
+            $this->open();
+        }
+
         if ($this->stream) {
             /** @psalm-suppress InvalidPropertyAssignmentValue */
             \fclose($this->stream);