use app default event loop for websocket calls

[petli-full]

For websocket calls, instead of creating a new event loop, it's better using the default one. This allows other IO events can be attached to the same event loop and act on each other accordingly. For example (pseudo code),

// signal a pod by another IO event
$conn = null;

$pod->attach(function (WebSocket $connection) use (&$conn) {
    $conn = $connection;
    ......
});

$loop->addTimer(0.8, function () use (&$conn) {
    if ($conn) $conn->send('0123456789');
});

Besides, it is recommended by ReactPHP. The create method has been deprecated: https://github.com/reactphp/event-loop/blob/1.x/src/Factory.php#L13-L34

[codecov]

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[stale]

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