fix(endpoint): add fasttrack

Author: bytestarter

volcenginesdkcore/endpoint/providers/default_provider.py

@@ -423,6 +423,12 @@ def get_endpoint_for(self, region, suffix=endpoint_suffix):
         global_endpoint='',
         region_endpoint_map={},
     ),
+    'fasttrack': ServiceEndpointInfo(
+        service='fasttrack',
+        is_global=False,
+        global_endpoint='',
+        region_endpoint_map={},
+    ),
 }
 
 bootstrap_region = {