Added an enum for Webhook Status

src/alpine_bits_python/const.py

@@ -1,7 +1,16 @@
-from enum import IntEnum
+from enum import IntEnum, StrEnum
 from typing import Final
 
 
+class WebhookStatus(StrEnum):
+    """Allowed webhook processing statuses for AlpineBits."""
+
+    PROCESSING = "processing"
+    COMPLETED = "completed"
+    FAILED = "failed"
+    PENDING = "pending"
+
+
 class HttpStatusCode(IntEnum):
     """Allowed HTTP status codes for AlpineBits responses."""