amqp: allow to configure heartbeats

[basert]

Allows to configure AMQP heartbeats: https://www.rabbitmq.com/docs/heartbeats

When using heartbeat the client needs to periodically call checkHeartBeat, for example:

$amqp = new Queue\Broker\AMQP(heartbeat: 300);
$amqp->configureConnection(function (AbstractConnection $connection) {
  Timer::tick(10_000, fn () => $connection->checkHeartBeat());
});