SDK: fix Project.import_dataset incorrectly waiting for completion

You have to use the `import_status` action in order to query the input
status. Otherwise, the `/api/projects/{id}/dataset/` endpoint initiates a
dataset export. Currently, `import_dataset` inadvertently monitors the
status of that export, not the original import.

cvat-sdk/cvat_sdk/core/proxies/projects.py

@@ -54,6 +54,7 @@ def import_dataset(
 
         DatasetUploader(self._client).upload_file_and_wait(
             self.api.create_dataset_endpoint,
+            self.api.retrieve_dataset_endpoint,
             filename,
             format_name,
             url_params={"id": self.id},

cvat-sdk/cvat_sdk/core/uploading.py

@@ -325,20 +325,23 @@ def upload_file_and_wait(
 class DatasetUploader(Uploader):
     def upload_file_and_wait(
         self,
-        endpoint: Endpoint,
+        upload_endpoint: Endpoint,
+        retrieve_endpoint: Endpoint,
         filename: Path,
         format_name: str,
         *,
         url_params: Optional[Dict[str, Any]] = None,
         pbar: Optional[ProgressReporter] = None,
         status_check_period: Optional[int] = None,
     ):
-        url = self._client.api_map.make_endpoint_url(endpoint.path, kwsub=url_params)
+        url = self._client.api_map.make_endpoint_url(upload_endpoint.path, kwsub=url_params)
         params = {"format": format_name, "filename": filename.name}
         self.upload_file(
             url, filename, pbar=pbar, query_params=params, meta={"filename": params["filename"]}
         )
 
+        url = self._client.api_map.make_endpoint_url(retrieve_endpoint.path, kwsub=url_params)
+        params = {"action": "import_status"}
         self._wait_for_completion(
             url,
             success_status=201,