feat(fal_client): add support for webhook in submit() (#335)

projects/fal_client/src/fal_client/client.py

@@ -316,6 +316,7 @@ async def submit(
         *,
         path: str = "",
         hint: str | None = None,
+        webhook_url: str | None = None,
     ) -> AsyncRequestHandle:
         """Submit an application with the given arguments (which will be JSON serialized). The path parameter can be used to
         specify a subpath when applicable. This method will return a handle to the request that can be used to check the status
@@ -325,6 +326,9 @@ async def submit(
         if path:
             url += "/" + path.lstrip("/")
 
+        if webhook_url is not None:
+            url += f"?fal_webhook={webhook_url}"
+
         headers = {}
         if hint is not None:
             headers["X-Fal-Runner-Hint"] = hint
@@ -496,6 +500,7 @@ def submit(
         *,
         path: str = "",
         hint: str | None = None,
+        webhook_url: str | None = None,
     ) -> SyncRequestHandle:
         """Submit an application with the given arguments (which will be JSON serialized). The path parameter can be used to
         specify a subpath when applicable. This method will return a handle to the request that can be used to check the status
@@ -505,6 +510,9 @@ def submit(
         if path:
             url += "/" + path.lstrip("/")
 
+        if webhook_url is not None:
+            url += f"?fal_webhook={webhook_url}"
+
         headers = {}
         if hint is not None:
             headers["X-Fal-Runner-Hint"] = hint