Register Update handler dynamically

[roxblnfk]

What was changed

Added Workflow::registerUpdate($name, $handler, $validator) to register updates dynamically

#[WorkflowMethod]
public function handler()
{
   Workflow::registerUpdate(
      'my-update',
      fn(Task $task) => $this->queue->push($task),
      fn(Task $task) => $this->isValidTask($task) or throw new \InvalidArgumentException('Invalid task'),
   );
}

Checklist

1. Closes [Feature Request] Dynamic Update handler #497
2. How was this tested: added autotests
3. Documentation: PHP SDK: update documentation about updates documentation#3075

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Name	Status	Preview	Comments	Updated (UTC)
php	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Sep 10, 2024 9:58am

[Sushisource]

I think it's a little strange for the example to be registering the handler in a function called handler which is also the workflow method. Maybe just call the function exampleWorkflow or something.

[roxblnfk]

Removed the function wrapper for all Workflow::register* methods.