feat: add deferred tool

[eznix86]

fixes #200

What you get:

class SyncInventoryTool implements Tool, ShouldDeferTool
{
  // ...
}

// or 

#[Deferred]
class ReindexKnowledgeBaseTool implements Tool
{
    // ...
}

Event triggered: DeferredToolQueued

php artisan queue:listen

   INFO  Processing jobs from the [default] queue.  

  2026-02-22 13:29:54 Laravel\Ai\Jobs\RunDeferredTool ................ RUNNING
  2026-02-22 13:29:54 Laravel\Ai\Jobs\RunDeferredTool ............ 4.05ms DONE