feat: add max messages batching for Cloud Storage subscriptions (#1224)

Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>

google/pubsub_v1/types/pubsub.py

@@ -1432,6 +1432,10 @@ class CloudStorageConfig(proto.Message):
             Storage file before a new file is created. Min 1 KB, max 10
             GiB. The max_bytes limit may be exceeded in cases where
             messages are larger than the limit.
+        max_messages (int):
+            Optional. The maximum number of messages that
+            can be written to a Cloud Storage file before a
+            new file is created. Min 1000 messages.
         state (google.pubsub_v1.types.CloudStorageConfig.State):
             Output only. An output-only field that
             indicates whether or not the subscription can
@@ -1551,6 +1555,10 @@ class AvroConfig(proto.Message):
         proto.INT64,
         number=7,
     )
+    max_messages: int = proto.Field(
+        proto.INT64,
+        number=8,
+    )
     state: State = proto.Field(
         proto.ENUM,
         number=9,

samples/generated_samples/snippet_metadata_google.pubsub.v1.json

@@ -8,7 +8,7 @@
     ],
     "language": "PYTHON",
     "name": "google-cloud-pubsub",
-    "version": "2.22.0"
+    "version": "0.1.0"
   },
   "snippets": [
     {