refactor!: improve types in platform api (#376)

I was just tired of doing those `assert($response instanceof ...);`
statements
also resolves the special status of `AsyncResponse` by decoupling it
from the `ResponseInterface`

WDYT?

Author: chr-hertel

src/Profiler/TraceablePlatform.php

@@ -14,7 +14,7 @@
 use Symfony\AI\Platform\Message\Content\File;
 use Symfony\AI\Platform\Model;
 use Symfony\AI\Platform\PlatformInterface;
-use Symfony\AI\Platform\Response\ResponseInterface;
+use Symfony\AI\Platform\Response\ResponsePromise;
 
 /**
  * @author Christopher Hertel <[email protected]>
@@ -23,7 +23,7 @@
  *     model: Model,
  *     input: array<mixed>|string|object,
  *     options: array<string, mixed>,
- *     response: ResponseInterface,
+ *     response: ResponsePromise,
  * }
  */
 final class TraceablePlatform implements PlatformInterface
@@ -38,7 +38,7 @@ public function __construct(
     ) {
     }
 
-    public function request(Model $model, array|string|object $input, array $options = []): ResponseInterface
+    public function request(Model $model, array|string|object $input, array $options = []): ResponsePromise
     {
         $response = $this->platform->request($model, $input, $options);
 
@@ -50,7 +50,7 @@ public function request(Model $model, array|string|object $input, array $options
             'model' => $model,
             'input' => \is_object($input) ? clone $input : $input,
             'options' => $options,
-            'response' => $response->getContent(),
+            'response' => $response,
         ];
 
         return $response;