python compat fixes

client-libs/python/openpipe/openpipe_meta.py

@@ -1,7 +1,2 @@
-from attr import dataclass
-
-
-@dataclass
-class OpenPipeMeta:
-    # Cache status. One of 'HIT', 'MISS', 'SKIP'
-    cache_status: str
+def openpipe_meta(cache_status: str):
+    return {"cache_status": cache_status}